GB889573A - Improvements in or relating to indicating devices for heat treatment - Google Patents

Improvements in or relating to indicating devices for heat treatment

Info

Publication number
GB889573A
GB889573A GB4193659A GB4193659A GB889573A GB 889573 A GB889573 A GB 889573A GB 4193659 A GB4193659 A GB 4193659A GB 4193659 A GB4193659 A GB 4193659A GB 889573 A GB889573 A GB 889573A
Authority
GB
United Kingdom
Prior art keywords
envelope
temperature
wick
compartment
length
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.)
Expired
Application number
GB4193659A
Inventor
Alan Rutherford Ritchie
Kenneth Holland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Macarthys Ltd
Original Assignee
Macarthys Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Macarthys Ltd filed Critical Macarthys Ltd
Priority to GB4193659A priority Critical patent/GB889573A/en
Publication of GB889573A publication Critical patent/GB889573A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
    • G01K3/04—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values in respect of time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

889,573. Temperature indicators. MACARTHYS Ltd. Nov. 25, 1960 [Dec. 9, 1959], No. 41936/59. Class 97(3). An indicator for heat treatment comprises an envelope having first and second compartments, the two compartments Being connected by a wick or like porous member, but.otherwise sealed from each other, the wick or the like extending into the second compartment at least a part of the length thereof and the first compartment containing an indicating substance which liquifies, or undergoes a sharp reduction of viscosity at a temperature to be indicated or a little below. The envelope may be transparent and made of a thin thermoplastic sheet material. The indicating substance may be benzoic acid containing a dye and the wick may consist of a strip of filter paper running the whole length of the envelope, being retained by heat seals joining the top and bottom walls of the envelope and sealing off the envelope at the two ends. The indicator is unaffected until the temperature rises to about 120‹C. At this temperature the benzoic acid melts and begins to creep along the filter paper strip, the extent of the: creep being clearly visible due to the dye present. The device may be calibrated and an indicating mark provided along the length of the wick in the second compartment to indicate the maintainance of the temperature at 120‹C., or higher, for a certain period, say 30 minutes.
GB4193659A 1959-12-09 1959-12-09 Improvements in or relating to indicating devices for heat treatment Expired GB889573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4193659A GB889573A (en) 1959-12-09 1959-12-09 Improvements in or relating to indicating devices for heat treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4193659A GB889573A (en) 1959-12-09 1959-12-09 Improvements in or relating to indicating devices for heat treatment

Publications (1)

Publication Number Publication Date
GB889573A true GB889573A (en) 1962-02-21

Family

ID=10422057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4193659A Expired GB889573A (en) 1959-12-09 1959-12-09 Improvements in or relating to indicating devices for heat treatment

Country Status (1)

Country Link
GB (1) GB889573A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324723A (en) * 1964-03-09 1967-06-13 Macarthys Ltd Indicating devices for heat treatment
US3785336A (en) * 1971-07-01 1974-01-15 Bio Medical Sciences Inc Temperature indicator
DK151369B (en) * 1975-04-14 1987-11-30 Info Chem Inc sterility indicator
USRE34515E (en) 1979-06-11 1994-01-18 Pymah Corporation Steam sterilization indicator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324723A (en) * 1964-03-09 1967-06-13 Macarthys Ltd Indicating devices for heat treatment
US3785336A (en) * 1971-07-01 1974-01-15 Bio Medical Sciences Inc Temperature indicator
DK151369B (en) * 1975-04-14 1987-11-30 Info Chem Inc sterility indicator
USRE34515E (en) 1979-06-11 1994-01-18 Pymah Corporation Steam sterilization indicator

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