AU2002329716A1 - Changed condition indicator - Google Patents
Changed condition indicatorInfo
- Publication number
- AU2002329716A1 AU2002329716A1 AU2002329716A AU2002329716A AU2002329716A1 AU 2002329716 A1 AU2002329716 A1 AU 2002329716A1 AU 2002329716 A AU2002329716 A AU 2002329716A AU 2002329716 A AU2002329716 A AU 2002329716A AU 2002329716 A1 AU2002329716 A1 AU 2002329716A1
- Authority
- AU
- Australia
- Prior art keywords
- reactant
- housing
- interior
- capsule
- reactants
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Description
CHANGED CONDITION INDICATOR
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an indicating apparatus and method of manufacture. More particularly, this invention relates to devices for indicating a change in condition by producing a color change and methods of manufacture therefor.
2. Description of the Related Art
h the preparation and storage of foodstuffs, both raw and cooked, it is desirable to have
some manner of indicating whether frozen items have previously been thawed. This is true in both home and commercial (such as a grocery store, supermarket, or restaurant) settings. Such information is useful from health, safety, and nutritional standpoints.
h the healthcare industry, it is well known that some vaccines, blood, various medications, etc. are temperature-sensitive. Because such materials may not function properly if
frozen and then thawed, it is not only desirable but also essential to know whether these materials have been previously frozen. Similarly, it would be very beneficial to l now whether material, which is stored frozen, is allowed to thaw and subsequently is refrozen.
Maximum-minimum thermometers maybe used to indicate the range of temperatures to
which an item has been exposed. However, the use of such apparatus with every item in a frozen food department of a grocery store or supermarket, or with every container of vaccine, blood,
drug, or other heat fragile item, is both impracticable and prohibitively costly.
Freeze-thaw indicators are known. For example, the Applicant's previous patent, U.S.
Patent No. 4,163,427, which is incorporated by reference herein in its entirety, discloses an
apparatus in which melting ice is used to activate a dye formation in producing a color indication
of thawing. The present invention uses a pigment rather than a dye to indicate a freeze-to-thaw
transition. The use of a pigment allows for a greater clarity of indication, a reduced chance of error, and a reduction in manufacturing costs.
Another known device is marketed under the name "ColdMark Freeze Indicators." This
device comprises three liquids that provide a color change upon extended exposure below a
certain temperature and another color change upon extended exposure above the temperature. However, this device is much larger than, and much more expensive than, the device of the
present invention.
SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for indicating a change in condition.
It is a further object of the present invention to provide an apparatus for indicating a transition from a frozen condition to a thawed condition.
It is a further object of the present invention to provide an apparatus for indicating a change in time.
It is a further object of the present invention to provide an improved indicator apparatus. It is a further object of the present invention to provide a reliable indicator apparatus.
It is a further object of the present invention to provide an inexpensive indicator
apparatus.
It is a further object of the present invention to provide an indicator apparatus that uses a
pigment indicator. It is a further object of the present invention to provide an indicator apparatus that can use
a single frangible capsule.
It is a further object of the present invention to provide an indicator apparatus that can be
used to monitor a small item, such as an individual vaccine vial.
It is a further object of the present invention to provide an indicator apparatus that creates
a brilliant color upon a freeze-to-thaw event.
The apparatus of the present invention indicates a freeze-to-thaw condition using two
reactants that combine to produce a pigment. A pigment is insoluble in the medium in which it is applied, while a dye is soluble. The use of a pigment is superior to the use of a dye since, for example, a pigment can produce a more brilliant color with smaller amounts of each reactant.
Additionally, pigment reactants are less likely to produce a color change with anything other than the complementary reactant.
A housing is provided. One or more capsules are provided within the housing. As used herein, "capsule" refers to any closed receptacle and includes microcapsules. A first reactant and a liquid are provided inside the capsule. The liquid is chosen such that it expands upon freezing.
The capsule is designed such that when the liquid freezes and expands, the capsule fractures. A
second reactant is provided within the housing. The location of the second reactant and the
means of coupling (if any) to the housing may take various forms. For example, the second
reactant may take the form of a coating on the housing. The second reactant may also be mixed
with an adhesive for coupling the second reactant to the housing. The second reactant may also take the foπn of a coating on the outside of the capsule. The second reactant may be coupled to a
piece of material, such as paper, and the material placed inside the housing.
When the capsule and the liquid located therein freeze, the liquid expands. Since the
capsule does not expand upon freezing, the expansion of the liquid fractures the capsule. When the capsule is subsequently thawed, the liquid melts, releasing the first reactant. The first and second reactants then combine to form a pigment. The pigment is a brilliant color that is chosen
to be a different color than the housing, allowing a person viewing the freeze-thaw indicator
device to quickly and easily know whether the device has been previously frozen and thawed.
The device of the present invention maybe attached to any number of items in order to
determine whether the items have been frozen and thawed. Exemplary preferred items to monitor include, but are not limited to, vaccines, other medications, food, and other temperature-sensitive
items.
The device of the present invention may also be initiated manually. Rather than fracture
via expansion upon freezing, the device of the current invention can be initiated by manually fracturing the capsule, thus allowing the device to be used as a time-temperature indicator.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is described with reference to the accompanying drawings, in which like reference characters reference like elements, and wherein:
Figure 1 is a perspective view of a preferred embodiment of the indicator of the present
invention;
Figure 2 is a top view of the indicator of Figure 1 indicating a safe condition;
Figure 3 is a top view of the indicator of Figure 1 indicating a transition from a frozen
condition to a thawed condition;
Figure 4 is a sectional view of the indicator of Figure 1 taken along line 4-4;
Figure 5 is a sectional view of another preferred embodiment of the indicator of the present invention;
Figure 6 is a sectional view of another preferred embodiment of the indicator of the
present invention;
Figure 7 is a sectional view of another preferred embodiment of the indicator of the present invention; and
Figure 8 is a sectional view of another preferred embodiment of the indicator of the
present invention.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 is a perspective view of a preferred embodiment of the indicator of the present
invention. For exemplary purposes only, the embodiment of a freeze-thaw indicator will be
discussed; however, other embodiments are equally available for use. The device 10 comprises a
housing 20 and a capsule 30. Housing 20 defines an interior 22. Interior 22 is bounded by a first
surface 24 and a second surface 27 (see Figure 4). A first reactant 26 is provided within housing 20. Reactant 26 may be located within housing 20 in various ways. For example, reactant 26 can
be applied directly to surface 24 or reactant 26 may be applied to a piece of material, such as filter
paper, and the material placed inside housing 20. hi addition to filter paper, other carriers may
also be used with the present invention.
Capsule 30 is located within housing 20. Capsule 30 contains a second reactant 32.
Capsule 30 also contains a liquid 34. Liquid 34 is chosen such that it expands upon freezing. A preferred form of liquid 34 is an aqueous solution. Capsule 30 is designed such that it will
fracture when liquid 34 freezes. After fracture, reactant 32 can escape capsule 30 to mix with reactant 26. This will not occur, however, while device 10 is in a frozen condition. When device
10 enters a thawed condition, liquid 34 melts/thaws, releasing reactant 32. Reactant 32 then mixes with reactant 26 to form a pigment, indicating that device 10 has made the transition from
a frozen condition to a thawed condition. Note that the rigidity of housing 20 can function as a means to protect against crushing of capsule 30.
Figure 2 is a top view of the freeze-thaw indicator of Figure 1 indicating a safe condition. Either device 10 has never been frozen or has been frozen and not thawed. One can view first surface 24 through second surface 27. h this condition, surface 24 has a first color 40.
Figure 3 is a top view of the freeze-thaw indicator of Figure 1 indicating a transition from a frozen condition to a thawed condition. Device 10 has been frozen and capsule 30 has been
fractured. Reactants 32 and 26 have combined to form a pigment. This pigment causes surface
24 to become brilliantly colored to a second color 42, color 42 being different than color 40. Alternatively, if reactant 26 was placed on a piece of material, the material and not necessarily surface 24 will become colored upon mixture of reactants 26, 32. Thus a person can easily
determine whether device 10 - and therefor any item to which device 10 has been attached - has
previously been frozen and thawed.
Figure 4 is a sectional view of the freeze-thaw indicator of Figure 1 taken along line 4-4.
It is seen that in a preferred embodiment, housing 20 can have two layers 46, 48. At least a portion of layer 46 is transparent, allowing one to view inside housing 20. At least a portion of
layer 48 contains an adhesive, allowing device 10 to be coupled to an item to be monitored. One
preferred material for housing 20 is foam-board. This material is readily available and
inexpensive. Another preferred material for housing 20 is cork. Cork is also readily available and is less crushable than foam-board, which facilitates the manufacturing process. However, housing 20 can be made of any suitable material.
For illustrative purposes only, a preferred manufacturing process will be discussed using
cork as the material of housing 20. Device 10 may be manufactured by first providing an amount of cork, preferably in the form of a roll. The cork can then be machined in known fashion to form
interior 22. Several interiors 22 can be formed simultaneously. Preferably, the cork has already been treated with an adhesive on each side. Alternatively, adhesive can be applied subsequent to machining interiors 22 in the cork. Once interior 22 has been formed, first reactant 26 can be
added. Reactant 26 may be applied to a piece of material, such as paper, and that material placed within interior 22. Capsule 30, which has been manufactured previously and has second reactant 32 and liquid 34 located therein, is then added to interior 22. Transparent layer 46 and adhesive
layer 48 can then be added on either side of housing 20, creating a closed volume for interior 22.
A preferred method of attachment is lamination. The completed device 10 can then be coupled to
an item to be monitored. It should be noted that the order of the steps of the above process can be
altered. For example, transparent layer 46 or adhesive layer 48 can be applied to housing 20 prior
to adding first reactant 26. In this manner, first reactant 26 can be applied directly to transparent
layer 46 or adhesive layer 48. The reactants discussed above cooperate to form a pigment upon mixing. Use of a
pigment as an indicator is better than use of a dye for several reasons. First, pigments are
insoluble in water and are solid particles rather than solutions. Dyes completely dissolve in water and are, therefore, solutions. Thus, a smaller amount of each reactant is needed to create a reliable indicator with a pigment than with a dye. This allows an indicator using pigment
reactants to use fewer capsules and be smaller than an indicator using dye reactants. As few as a
single capsule may be used with the present invention. A smaller indicator may be attached to
more items - such as an individual vaccination vial - than are possible with a larger indicator.
Secondly, it is possible to get more "color" into pigments than into dyes. Therefore, pigmented colors tend to be more vibrant and brilliant than dye-based colors. A more brilliant,
vibrant color is desirable with a freeze-thaw indicator to increase readability and decrease the
likelihood of an erroneous reading. Thus, an indicator with pigment reactants is more reliable than one with dye reactants.
Thirdly, pigment reactants are less likely to react with anything other than the
complementary reactant. Thus, an indicator with pigment reactants is more reliable than one with dye reactants.
Finally, the molecules in a dye are spread out and are therefore prone to fading. The
molecules in a pigment are spaced closer together and are therefore less prone to fading. If the
color in an activated indicator (that is, an indicator that has been frozen and thawed) fades, one
might erroneously be lead to believe that the item to which the indicator is attached has been
continuously frozen. As discussed above, this could lead to grave consequences. Thus, an indicator with pigment reactants is more reliable than one with dye reactants.
Exemplary preferred reactants include water soluble sodium dimethylglyoxime and any water soluble nickel salt, such as nickel chloride. The sodium dimethylglyoxime could be inside the capsule and the nickel salt outside or vice versa. These reactants combine to form a brilliant
scarlet, solid, colloidal crystal. These reactants are highly specific and are unlikely to form such a
color with other substances. Other pigment reactants may also be used with the indicator of the
present invention and other pigment colors may be produced upon a freeze-thaw transition. Once the reactants combine to form a pigment, the pigment remains even if the device is subsequently
refrozen. The capsules that are used with the present invention were manufactured using the
equipment described in U.S. Patent No. 3,389,194, the disclosure of which is incorporated herein in its entirety. Three capsule shell materials were developed. The first shell composition was
made of paraffin wax. The second shell composition was made of a paraffin wax blended with a
hydrocarbon resin. The third shell composition was made of a paraffin wax blended with a hydrocarbon resin and a polyethylene, piccolyte S-115 is a preferred hydrocarbon resin. All the
capsules were prepared with 5% dimethylglyoxime as a solute in water and the fill to shell ratio
ranged from 50/50 to 60/40. Upon testing, the third shell composition was found to result in more completely cracked capsules upon freezing.
A preferred composition comprises 40% paraffin wax, 50% piccolyte S-115 (a
hydrocarbon resin), and 10%) polyethylene, with a 60% fill to 40%) shell ratio. This composition
was found to result in proper brittleness at freezing so that assurance of capsule cracking was increased.
Although the capsules were filled with a 5% solution of dimethylglyoxime and the co-
reactant was located externally to the capsules, the location of the reactants could have been
reversed. Also, the capsules could be loaded with a reducing agent such as a 10% solution of sodium bisulfite, or an acid solution, or a base solution and placed upon a colored matrix which
when reduced, acidified or alkalinized changes from one color to another.
It may be desirable to determine whether capsules 30 are suitable for use prior to
manufacturing device 10. To do this, one can immerse capsules 30 in a solution containing a
complementary reactant to that included within capsule 30. For example, if sodium dimethylglyoxime is used as the reactant within capsules 30, the solution can contain a solution
of nickel chloride. A preferred solution contains 5% nickel chloride in water, to which 20%> by weight glycerol is added. If a capsule is already fractured, and therefore unsuitable for use, the
reactants will combine to produce a brilliant pigment when the capsule is immersed in the solution. Those capsules that do not produce a color change are suitable for use and may be separated for subsequent use in the present invention.
During testing of the present invention, it was discovered that capsules tested according to
the above process retained a coating of reactant on the outer surface of the capsule 30 when
removed from the solution and allowed to dry. When the capsules 30 that tested as good for use
were subsequently fractured, the reactant inside capsule 30 combined with the reactant on the
outer surface of capsule 30 to form a brilliant pigment. This indicates that capsules 30 may be coated with the second reactant and used in the device 10 of the present invention, without the need of separately including a reactant in the interior 22 of housing 20.
Figure 5 is a sectional view of another preferred embodiment of the freeze-thaw indicator of the present invention. Device 110 comprises a housing 20 and a capsule 30 (described above). Housing 20 includes layers 46, 48 and defines a volume 22. Capsule 30 has a first reactant 26 and a liquid 34 included therein. Liquid 34 is chosen such that it expands upon freezing. Device
110 further comprises a piece of material 120. Material 120 may be impregnated with second
reactant 32. Alternatively, reactant 32 may be topically applied to material 120. Material 120
may take any desired form, as long as it is able to host reactant 32. Preferred forms of material 120 include, but are not limited to, paper (such as filter paper) and cotton. Upon freezing and expansion of liquid 34, capsule 30 fractures. Upon subsequent melting or thawing of liquid 34,
reactant 26 is released from capsule 30 such that it contacts material 120 and reactant 32. Reactants 26 and 32 cooperate to form a brilliant pigment, notifying a viewer that device 110 - and therefor any item to which device 110 has been attached - has previously been frozen and thawed.
Figure 6 is a sectional view of another preferred embodiment of the freeze-thaw indicator
of the present invention. Device 210 comprises a capsule 30 (described above) and a blister pack
220. Blister packs 220 are known and commonly used to package, for example, over-the-counter
medications. Blister pack 220 includes a cover 222 and a backing 224. Cover 222 is substantially transparent, allowing one to view inside device 210. Backing 224 includes a first
surface 225. An adhesive may be applied to surface 225 to couple device 210 to an item to be
monitored. A first reactant is included within capsule 30. A second reactant may be applied to a
piece of material 230, which is enclosed along with capsule 30 within blister pack 220. Alternatively, the second reactant maybe applied to a second surface 226 of backing 224 using, for example, an adhesive such as latex. A preferred adhesive is polyvinyl acetate latex; a
preferred reactant-latex mix includes 10-20% by volume latex. Alternatively, the second reactant
may be applied to the outer surface of capsule 30. With the latter two alternatives, material 230 is not required. As discussed above, when capsule 30 fractures upon freezing and subsequently thaws, the reactants combine to form a pigment, notifying an observer that the item to which device 210 is attached has experienced a freeze-to-thaw transition.
Figure 7 is a sectional view of another preferred embodiment of the freeze-thaw indicator
of the present invention. Device 310 comprises a housing 320 and a capsule 30. Housing 320 is substantially cylindrical and has an outer surface 330. The longitudinal ends of housing 320 may be crimped or sealed in any known manner. Device 310 may be attached to an item to be
monitored in known manner, such as by applying an adhesive to surface 330. The reactants are
included in any manner described above. Upon a freeze-to-thaw transition, the reactants mix as
described above to produce a vibrant color, allowing one to easily determine whether the item to
which device 310 is attached has been previously frozen and thawed.
Figure 8 is a sectional view of another preferred embodiment of the freeze-thaw indicator of the present invention. The device 410 of Figure 8 is similar to the device 310 of Figure 7, but
includes an additional housing 420. Housing 420 and housing 320 cooperate to define a volume
430. Volume 430 functions as an air space, which is an insulator. This insulation may prevent obtaining a premature indication of a thaw condition. The amount of insulation can be varied as
desired by varying the relative diameters of the housings 320, 420 (which therefore will vary the
size of volume 430). A preferred method of including the second reactant for the embodiments of Figures 7 and
8 is to prepare a reactant-latex mix as described above. The reactant-latex mix can then be drawn
into the housing 320, such as by suction. The reactant-latex mix can then be removed from
housing 320, such as by draining due to gravity. A film of the mix will remain on an inner surface 340 of housing 320. During testing, it was discovered that a film formed accordingly
contained enough reactant to produce a vibrant color change upon a freeze-thaw condition. This
process worked on a housing made of polyethylene, which is known not to be easily coated. This process also worked on a paraffin wax coating of the capsules themselves. Tins process is fast, inexpensive, and readily adaptable to devices of virtually any size.
By changing the reactants, the device of the present invention may also be used as a time- temperature indicator. For example, by coating the housing with a gelatin-immobilized urease
(an enzyme that breaks down urea to ammonia and carbon dioxide) together with a mixture of pH
indicators and filling the capsule with a urea solution, upon fracture of the capsule the reactants
will mix. This will allow the urease to produce the breakdown products of urea in response to
time and temperature according to the Arrenhius equation. As these products (ammonia and
carbon dioxide) accumulate in response to time, temperature, or both, the pH of the coating will
change. This change in pH will result in a color change based on the indicators chosen. The
concentration of the urea solution can be varied in concentration to allow for various time or temperature scenarios. Note that the capsule can be fractured by either external or internal
pressure. Other chemical combinations may also be used.
By providing a relatively flexible (or at least less rigid) housing 20, 220, 320, 420, a user
can initiate the process by manually fracturing capsule 30. This can be done, for example, by squeezing housing 20, 220, 320, 420. The device 10, 110, 210, 310, 410 can then be attached to
an item to be monitored. By doing so, an observer can determine how long the item being monitored has been in its current condition (for example, held at room temperature). Note that by
providing a less rigid housing 20, 220, 320, 420, there is no need to freeze the device 10, 110,
210, 310, 410 prior to use. Device 10, 110, 210, 310, 410, when used as a time-temperature indicator, is of the same design and manufacturing as described above with respect to the freeze-
thaw indicators.
While the preferred embodiments of the present invention have been described above, it
should be understood that they have been presented by way of example only, and not of limitation. It will be apparent to persons skilled in the relevant art that various changes in form
and detail can be made therein without departing from the spirit and scope of the invention. Thus
the present invention should not be limited by the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (25)
1. A device for indicating a transition from a frozen condition to a thawed condition, comprising:
a housing having a first surface, at least a portion of said first surface being of a first color;
a first reactant located within said housing; and a capsule containing a liquid and a second reactant, said capsule being located within said
housing; wherein said liquid expands upon freezing; wherein said first and said second reactants cooperate to produce a pigment upon mixing; and
wherein said pigment is of a second color, said second color being different than said first color.
2. The device of claim 1 , wherein said capsule is designed such that it will fracture due to the expansion of said liquid upon freezing.
3. The device of claim 1 , wherein one of said first and said second reactants is a nickel salt and the other of said first and said second reactants is sodium dimethylglyoxime.
4. The device of claim 1, wherein said housing has a second surface opposite said first
surface, said second surface including a transparent portion for allowing one to view said first
surface.
5. The device of claim 1, wherein said housing has a third surface, said third surface having
an adhesive attached thereto for attaching said device to a product to be monitored.
6. A device for indicating a transition from a frozen condition to a thawed condition, comprising:
a housing defining an interior, at least a portion of said interior being of a first color; a first reactant located within said housing; and
a capsule containing a liquid and a second reactant, said capsule being located within said interior of said housing;
wherein said liquid expands upon freezing; wherein said first and said second reactants cooperate to produce a pigment upon mixing;
and
wherein said pigment is of a second color, said second color being different than said first color.
7. The device of claim 6, wherem one of said first and said second reactants is a nickel salt
and the other of said first and said second reactants is sodium dimethylglyoxime.
8. The device of claim 6, further comprising an adhesive for coupling said first reactant to said interior of said housing.
9. A device for indicating a transition from a frozen condition to a thawed condition,
comprising:
a housing defining an interior, said interior being of a first color; a capsule located within said interior of said housing, said capsule defining an interior
volume and containing a liquid and a first reactant within said volume, said capsule having an
exterior surface; and a second reactant located on said exterior surface of said capsule; wherein said liquid expands upon freezing; wherein said first and said second reactants cooperate to produce a pigment upon mixing;
and wherein said pigment is of a second color, said second color being different than said first
color.
10. The device of claim 9, wherein one of said first and said second reactants is a nickel salt
and the other of said first and said second reactants is sodium dimethylglyoxime.
11. A device, comprising: a housing;
a first reactant located within said housing; a frangible capsule located within said housing, said capsule containing a second reactant;
and
a third reactant located within said housing; wherein said first and second reactants cooperate to form a fourth reactant upon mixing;
and
wherein said third and fourth reactants cooperate to cause a color change upon mixing.
12. The device of claim 11, wherein one of said first and second reactants is urea and the other of said first and second reactants is urease.
13. The device of claim 11, wherein said housing is flexible enough to allow a user to deform
said housing in order to fracture said frangible capsule.
14. A method of making a device for indicating a transition from a frozen condition to a
thawed condition, comprising: providing a first housing having an interior and at least one opening;
coating said interior with a first reactant;
placing a capsule containing a second reactant and a liquid within said interior; and
closing said opening to form a closed volume defined by said interior.
15. The method of claim 14, wherein said coating includes:
providing a reactant-adhesive mix;
placing said mix within said interior; and removing said mix from said interior, leaving a film of said mix on at least a portion of
said interior.
16. The method of claim 15, wherein said placing includes drawing said mix within said
interior.
17. The method of claim 15, wherein said removing includes draining said mix from said interior.
18. The method of claim 17, wherein said draining includes draining said mix from said
interior by gravity.
19. The method of claim 14, further comprising: providing a second housing spaced apart from and surrounding said first housing to define
a volume between said first and second housings, said second housing having at least one
opening.
20. The method of claim 19, wherein said closing includes closing said openings of said first and second housings together to form a first closed volume defined by said interior and a second
closed volume intermediate said first and second housings.
21. A method of making a device for indicating a transition from a frozen condition to a
thawed condition, comprising: providing a substrate;
forming a cavity within said substrate;
placing a first reactant with said cavity;
placing a capsule containing a liquid and a second reactant within said cavity; and placing a cover layer over said cavity to enclose said cavity.
22. The method of claim 21, wherein said placing said first reactant includes:
placing said first reactant on a carrier; and placing said carrier within said cavity.
23. The method of claim 21, wherein said placing includes placing said first reactant directly
on said substrate.
24. The method of claim 21 , further comprising:
placing an adhesive layer on said substrate.
25. The method of claim 21 , wherein said placing of said cover layer includes laminating said
cover layer to said substrate.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/925,538 | 2001-08-10 | ||
US09/925,538 US6694913B2 (en) | 2001-08-10 | 2001-08-10 | Changed condition indicator |
PCT/US2002/025222 WO2003014681A1 (en) | 2001-08-10 | 2002-08-08 | Changed condition indicator |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2002329716A1 true AU2002329716A1 (en) | 2003-06-19 |
AU2002329716B2 AU2002329716B2 (en) | 2008-04-24 |
Family
ID=25451868
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2002329716A Ceased AU2002329716B2 (en) | 2001-08-10 | 2002-08-08 | Changed condition indicator |
Country Status (8)
Country | Link |
---|---|
US (2) | US6694913B2 (en) |
EP (1) | EP1425560B1 (en) |
CN (1) | CN1554016B (en) |
AU (1) | AU2002329716B2 (en) |
HK (1) | HK1072099A1 (en) |
NZ (1) | NZ531654A (en) |
TW (1) | TW561250B (en) |
WO (1) | WO2003014681A1 (en) |
Families Citing this family (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0116653D0 (en) * | 2001-07-07 | 2001-08-29 | Temp Tell Ltd | Time temperature indicators linked to sensory detection |
US7770534B2 (en) * | 2001-08-10 | 2010-08-10 | Isadore Cooperman | Changed condition indicator |
AU2002367118A1 (en) * | 2002-01-03 | 2003-07-15 | Julian Levin | Freezer failure indicator |
US7299805B2 (en) | 2002-06-07 | 2007-11-27 | Marctec, Llc | Scaffold and method for implanting cells |
DE20219911U1 (en) * | 2002-12-23 | 2003-03-13 | Bsh Bosch Siemens Hausgeraete | Temperature display element for a refrigerator |
WO2004099744A2 (en) * | 2003-05-02 | 2004-11-18 | Sensitech Inc. | Methods and apparatus for indicating temperature-related events |
US6957693B2 (en) * | 2003-12-12 | 2005-10-25 | Honeywell International, Inc. | Heat exchanger thermal indicator |
US20050249899A1 (en) * | 2004-05-06 | 2005-11-10 | Bonutti Peter M | Biodegradable packaging material |
US7004621B2 (en) * | 2004-06-17 | 2006-02-28 | Cryovac, Inc. | Method of monitoring temperature exposure |
JP2008510987A (en) | 2004-08-24 | 2008-04-10 | スカイラド エルティーディー. | Temperature sensing product indicating device |
US20060130735A1 (en) * | 2004-12-16 | 2006-06-22 | Beech Tree Sensors Llc | Temperature sensor |
US8077554B2 (en) | 2005-04-29 | 2011-12-13 | Ambrozy Rel S | Stimulus indicating device employing polymer gels |
EP1877761A4 (en) * | 2005-04-29 | 2010-03-24 | Rel S Ambrozy | Stimulus indication employing polymer gels |
US20120032117A1 (en) | 2005-04-29 | 2012-02-09 | Ambrozy Rel S | Stimulus indicating device employing polymer gels |
US7940605B2 (en) * | 2005-04-29 | 2011-05-10 | Prasidiux, Llc | Stimulus indicating device employing polymer gels |
US8166906B2 (en) | 2005-04-29 | 2012-05-01 | Ambrozy Rel S | Stimulus indicating device employing polymer gels |
US9182292B2 (en) | 2005-04-29 | 2015-11-10 | Prasidiux, Llc | Stimulus indicating device employing polymer gels |
US20070059402A1 (en) * | 2005-09-13 | 2007-03-15 | Cryovac, Inc. | Carbon monoxide modified atmosphere packaging having a time temperature indicator |
JP4854265B2 (en) * | 2005-10-26 | 2012-01-18 | 株式会社ジークエスト | Irreversible low temperature indicator |
US7545630B2 (en) * | 2005-11-01 | 2009-06-09 | Dell Products L.P. | Method and apparatus for thermal dissipation |
US7343872B2 (en) * | 2005-11-07 | 2008-03-18 | Temptime Corporation | Freeze indicators suitable for mass production |
WO2007056752A2 (en) * | 2005-11-08 | 2007-05-18 | Temptime Corporation | Combination freeze indicators |
WO2008143537A1 (en) * | 2007-05-17 | 2008-11-27 | Invenview Sp. Z O.O. | Method and device for an irreversible indication of exceeding a set maximum temperature of frozen objects especially products |
AT504655B1 (en) | 2007-09-03 | 2008-07-15 | Schalkhammer Thomas | Sensory pigment for use in packaging materials of food and pharmaceutical product, comprises (bio)organic or inorganic polymer layer coated on particles of metal or metal-oxygen compound, and layer of chromophore particles on polymer layer |
US20090139250A1 (en) * | 2007-11-28 | 2009-06-04 | E & J Enterprises, Llc | Defrost indicator |
KR100873579B1 (en) * | 2008-07-21 | 2008-12-12 | 송원영 | Indicated label for temperature changing history of refrigerated or frozen product |
EP2473829A2 (en) * | 2009-08-31 | 2012-07-11 | Temptime Corporation | Freeze indicators with a controlled temperature response |
DE102009053927A1 (en) * | 2009-11-19 | 2011-05-26 | On Point Indicators Gmbh | Temperature indicator for the visual display of a temperature below room temperature |
US8430053B2 (en) | 2010-09-30 | 2013-04-30 | Temptime Corporation | Color-changing emulsions for freeze indicators |
US8957780B2 (en) * | 2011-07-07 | 2015-02-17 | Isadore Cooperman | System for remotely monitoring changes in condition |
DE102011082716A1 (en) * | 2011-09-14 | 2013-03-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Indicators element used in cell culture vessel for determining pH value of substance comprises polymeric material and indicator dye |
US9310262B2 (en) * | 2012-11-11 | 2016-04-12 | Omnitek Partners Llc | Method and apparatus for confirming whether a frozen food has been defrosted |
KR20140126552A (en) * | 2013-04-23 | 2014-10-31 | 인텔렉추얼디스커버리 주식회사 | Freeze indicator |
WO2015105485A1 (en) * | 2014-01-08 | 2015-07-16 | Empire Technology Development Llc | Phase change systems and methods for their preparation and use |
CN104897299B (en) * | 2014-05-14 | 2017-11-10 | 代明浩 | A kind of temperature quality inspection ball |
JP6383694B2 (en) * | 2015-03-30 | 2018-08-29 | 株式会社日立産機システム | Temperature history display body and manufacturing method thereof |
US10222273B2 (en) * | 2015-06-19 | 2019-03-05 | Thermoprox | Thermal proxy device using color changing technology |
US10908031B1 (en) * | 2015-10-16 | 2021-02-02 | Prasidiux, Llc | Stimulus indicating device employing the swelling action of polymer gels |
TWI579542B (en) * | 2016-06-15 | 2017-04-21 | 國立臺灣師範大學 | Temperature sensing device and method of using the same |
DE102017117478A1 (en) * | 2017-08-02 | 2019-02-07 | Joanneum Research Forschungsgesellschaft Mbh | Sensor material with temperature-dependent coloring |
CN112396949A (en) * | 2019-08-13 | 2021-02-23 | 余丽 | Activation method of environment-friendly low-temperature protection failure prompt label |
Family Cites Families (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2823131A (en) * | 1954-06-17 | 1958-02-11 | Bruce W Power | Food spoilage indicator |
US2850393A (en) * | 1956-07-23 | 1958-09-02 | Aseptic Thermo Indicator Compa | Frozen food telltale |
US3233459A (en) * | 1963-06-11 | 1966-02-08 | Bell Telephone Labor Inc | Temperature telltale |
US3177843A (en) * | 1964-02-13 | 1965-04-13 | Robert S Geocaris | Frozen food indicator |
GB1096640A (en) * | 1964-12-07 | 1967-12-29 | Monsanto Co | Micro-fiber spinning process |
US3751382A (en) * | 1969-03-13 | 1973-08-07 | Food Control | Enzymatic indicator and method of making it |
US3695903A (en) * | 1970-05-04 | 1972-10-03 | American Standard Inc | Time/temperature indicators |
US3786777A (en) * | 1970-12-31 | 1974-01-22 | Artech Corp | Irreversible warm-up indicator |
SE376657B (en) * | 1971-12-10 | 1975-06-02 | Food Control | |
US3958528A (en) * | 1973-10-23 | 1976-05-25 | Robert Hill | Product thaw indicator |
US4022149A (en) * | 1976-02-06 | 1977-05-10 | Lee Berger | Thaw indicator |
US4028876A (en) * | 1976-03-05 | 1977-06-14 | Lawrence Peska Associates, Inc. | Apparatus for visually indicating elapsed time by a color change |
FR2349824A1 (en) | 1976-04-30 | 1977-11-25 | Hill Robert | Defrosting indicator for frozen foods - employs clear plastic cell containing substance which diffuses into surrounding material if temp. rises above limit |
US4120818A (en) * | 1976-08-10 | 1978-10-17 | The United States Of America As Represented By The Secretary Of The Army | Irreversible warmup indicator |
US4145918A (en) | 1976-09-07 | 1979-03-27 | Akzona Incorporated | Freeze-thaw indicator |
US4148748A (en) | 1976-11-02 | 1979-04-10 | The Dow Chemical Company | Nonreversible freeze-thaw indicator |
US4132186A (en) * | 1977-10-31 | 1979-01-02 | Minnesota Mining And Manufacturing Company | Freeze indicating device |
US4163427A (en) | 1977-12-05 | 1979-08-07 | Isadore Cooperman | Freeze-thaw indicator apparatus |
US4191125A (en) | 1978-07-03 | 1980-03-04 | Akzona Incorporated | Freeze indicator |
US4280361A (en) * | 1979-06-08 | 1981-07-28 | Franco Sala | Device for detecting the defrosting of frozen products |
US4327117A (en) | 1980-03-18 | 1982-04-27 | Lenack Roger D | Thaw indicator for frozen foods |
ES267379Y (en) * | 1982-09-21 | 1983-10-16 | "IRREVERSIBLE INDICATOR OF TEMPERATURE DEFROSTING THAT IS REQUIRED". | |
US4457252A (en) * | 1982-11-09 | 1984-07-03 | Minnesota Mining And Manufacturing Company | Critical temperature indicator |
EP0138741B1 (en) * | 1983-09-05 | 1990-11-07 | Matsumoto Kosan Kabushiki Kaisha | Temperature-indicating sheet |
US4784876A (en) * | 1986-12-31 | 1988-11-15 | Lynwood Graphics, Inc. | Sympathetic ink and developer system |
US5254473A (en) * | 1990-03-16 | 1993-10-19 | Jp Laboratories | Solid state device for monitoring integral values of time and temperature of storage of perishables |
DE69032106D1 (en) | 1990-11-21 | 1998-04-09 | Jp Lab Inc | COLOR CHANGE INDICATOR FOR TIME DETERMINATION OF THE PERFORMANCE OF EFFECTABLE PRODUCTS |
US5182212A (en) | 1991-01-31 | 1993-01-26 | Oscar Mayer Foods Corporation | Time temperature indicator with distinct end point |
US5085802A (en) | 1991-01-31 | 1992-02-04 | Oscar Mayer Foods Corporation | Time temperature indicator with distinct end point |
US5111768A (en) | 1991-06-07 | 1992-05-12 | Pymah Corporation | Freeze indicator |
CN2108925U (en) * | 1991-12-18 | 1992-07-01 | 邓小庆 | Movement sensor for bicycle |
US5239942A (en) | 1992-05-11 | 1993-08-31 | Pymah Corporation | Freeze indicator |
US5404834A (en) | 1993-03-15 | 1995-04-11 | The United States Of America As Represented By The Secretary Of The Interior | Temperature indicating device |
US5695284A (en) * | 1994-06-22 | 1997-12-09 | Waters; Gary H. | Thaw indicator unit and method of manufacture |
DE19622671A1 (en) * | 1995-06-30 | 1997-01-02 | Basf Magnetics Gmbh | Temperature indicator for refrigerated products |
US5964181A (en) * | 1995-11-16 | 1999-10-12 | 3M Innovative Properties Company | Temperature indicating device |
-
2001
- 2001-08-10 US US09/925,538 patent/US6694913B2/en not_active Expired - Lifetime
-
2002
- 2002-08-08 NZ NZ531654A patent/NZ531654A/en not_active IP Right Cessation
- 2002-08-08 CN CN028176685A patent/CN1554016B/en not_active Expired - Fee Related
- 2002-08-08 WO PCT/US2002/025222 patent/WO2003014681A1/en not_active Application Discontinuation
- 2002-08-08 EP EP02765960.6A patent/EP1425560B1/en not_active Expired - Lifetime
- 2002-08-08 AU AU2002329716A patent/AU2002329716B2/en not_active Ceased
- 2002-08-09 TW TW091118022A patent/TW561250B/en not_active IP Right Cessation
-
2004
- 2004-02-23 US US10/782,801 patent/US7011037B2/en not_active Expired - Fee Related
-
2005
- 2005-06-08 HK HK05104809.8A patent/HK1072099A1/en not_active IP Right Cessation
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6694913B2 (en) | Changed condition indicator | |
AU2002329716A1 (en) | Changed condition indicator | |
JP5050249B2 (en) | Combined temperature exposure indicator | |
US4163427A (en) | Freeze-thaw indicator apparatus | |
EP1946056B1 (en) | Freeze indicators suitable for mass production | |
WO2007106463A2 (en) | Changed condition indicator | |
US4327117A (en) | Thaw indicator for frozen foods | |
JPS59104537A (en) | Indicator for critical temperature | |
US20100020846A1 (en) | Irreversible Coolness Indicator | |
WO2008144348A1 (en) | Freeze indicators, flexible freeze indicators and manufacturing methods | |
KR20140040717A (en) | Time-temperature indicator system i | |
KR20140035906A (en) | Time-temperature indicator system | |
US20070039383A1 (en) | Indicative sensor for stock control | |
CN108279076A (en) | A kind of critical temperature indicator based on Microencapsulated Slow effect | |
EP2413118A1 (en) | Temperature-time indicator system based on irreversible colour changes, and corresponding method | |
WO2013050846A2 (en) | Intelligent temperature indicator label and method | |
WO2003052367A1 (en) | A device for monitoring a predetermined temperature | |
EP0563318B1 (en) | Improved container for liquid crystal cumulative dosimeter | |
JP2004191345A (en) | Thawing detecting recording chip | |
JPH01134219A (en) | Temperature history detecting material | |
GB2457180A (en) | Irreversible coolness indicator |