CA1057789A - Extruded sealing strip - Google Patents
Extruded sealing stripInfo
- Publication number
- CA1057789A CA1057789A CA275,753A CA275753A CA1057789A CA 1057789 A CA1057789 A CA 1057789A CA 275753 A CA275753 A CA 275753A CA 1057789 A CA1057789 A CA 1057789A
- Authority
- CA
- Canada
- Prior art keywords
- seal
- strip
- polymeric material
- magnetisable
- opposite face
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/08—Parts formed wholly or mainly of plastics materials
- F25D23/082—Strips
- F25D23/087—Sealing strips
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/16—Sealing arrangements on wings or parts co-operating with the wings
- E06B7/22—Sealing arrangements on wings or parts co-operating with the wings by means of elastic edgings, e.g. elastic rubber tubes; by means of resilient edgings, e.g. felt or plush strips, resilient metal strips
- E06B7/23—Plastic, sponge rubber, or like strips or tubes
- E06B7/2314—Plastic, sponge rubber, or like strips or tubes characterised by the material
Abstract
Abstract of the Disclosure A magnetic seal for sealing against a metal surface, the seal being formed of a resiliently deformable polymeric material which contains a magnetised or magnetisable metallic strip at or adjacent one of its surfaces, and being of one-piece construction. The seal may be of a generally rectangular cross-section so as to be suitable for a refrigerator door seal, and the opposite face of the seal may be especially formed, e.g.
dovetailed, for connection to a surface, and a further magnet-isable metallic strip may be located just below the surface of the opposite face of the seal. Alternatively, the strip may be of a particular shape for sealing round door openings or the like in motor vehicles.
dovetailed, for connection to a surface, and a further magnet-isable metallic strip may be located just below the surface of the opposite face of the seal. Alternatively, the strip may be of a particular shape for sealing round door openings or the like in motor vehicles.
Description
lOS~'7~9 ~his invention relates to a sealing strip, formed for example by extrusion, and especially designed for foxming a seal against metal surfaces attracted by magnetism, such as between`a refrigerator door and the body of the refrig-erator.
Onè common known seal which is used on refrigerator doors is ~ormed from a rubbery or plastics material which is magnetic in nature and which is adhered either to the refrigerator frame or refrigerator door so that ~hen the door is closed, the seal will be attracted by magnetism to whichever of the frame or door it is not adhesively secured.
The seal is given its magnetic properties by incorporating in the pla~tics or rubbery mix prior to extrusion Barium or Strontium ferrite which is naturally magnetic. This known seal operates very satisfactorily but unfortunately it is expensive to manufacture because Barium and ~trontium ferrites are expensive.
Another known magnetic seal is a two part seal, oomprising a hollow rubber or plastics e~trusion, into which a magnetised strip is then inserted. This is expensive, because of the three manufacturing steps necessary. Purthermore, because of limitations in wall thickness, these kno-m magnetic seals have a gap between the magnetised strip and the sealing surface generally 0.020 inches or greater. Known magnetic technology prefers the lowest possible gap as the magnetic ~orce is reduced exponentially with increasing gap size.
We have now developed a seal suitable for refrigerator doors and m~ny other uses in which we can reduce the wall thickness between the magnetised strip and the surface to
Onè common known seal which is used on refrigerator doors is ~ormed from a rubbery or plastics material which is magnetic in nature and which is adhered either to the refrigerator frame or refrigerator door so that ~hen the door is closed, the seal will be attracted by magnetism to whichever of the frame or door it is not adhesively secured.
The seal is given its magnetic properties by incorporating in the pla~tics or rubbery mix prior to extrusion Barium or Strontium ferrite which is naturally magnetic. This known seal operates very satisfactorily but unfortunately it is expensive to manufacture because Barium and ~trontium ferrites are expensive.
Another known magnetic seal is a two part seal, oomprising a hollow rubber or plastics e~trusion, into which a magnetised strip is then inserted. This is expensive, because of the three manufacturing steps necessary. Purthermore, because of limitations in wall thickness, these kno-m magnetic seals have a gap between the magnetised strip and the sealing surface generally 0.020 inches or greater. Known magnetic technology prefers the lowest possible gap as the magnetic ~orce is reduced exponentially with increasing gap size.
We have now developed a seal suitable for refrigerator doors and m~ny other uses in which we can reduce the wall thickness between the magnetised strip and the surface to
- 2 -1(~577~9 zero and which is no more expensive to produce than known seals.
The present invention provides a seal as claimed in claim 1, which is of a type used in the automobile field for sealing around doors in motor vehicles, and comprises a hollow generally circular polymeric extrusion with the magnetisable or magnetised strip adjacent one face of the extrusion, the opposite face of which is connected to a U-shaped gripper for application to a flange around a door opening or door on the motor vehicle.
The present invention further provides a seal for sealing against a metal surface such as a refrigerator door, the seal being formed of a resiliently deformable polymeric material which carries a magnetised or magnetisable metallic strip at or adjacent one of its surfaces, the resiliently deformable polymeric material being extruded in one piece with the strip so as to be integral therewith.
The seal may be of any cross-sectional shape, and in one construction, the seal is of a generally rectangular cross-section and is suitable for a refrigerator door seal.
Preferably, the strip is of a ferrous metal which is located just below the surface and generally centrally along one of the longer faces of the seal. In this construction, the opposite face of the seal may be especially formed for connection to a surface, e.g. a refrigerator door or frame; for example, the opposite face may have a generally dove-tailed configuration for mating engagement in a re-entrant groove, for example in the frame or door or a refrigerator. Alternatively, the opposite face may be adapted for adhesively or otherwise securing the seal to the door or frame.
If desired, a further magnetisable metallic strip may be located just below the surface of the opposite face of
The present invention provides a seal as claimed in claim 1, which is of a type used in the automobile field for sealing around doors in motor vehicles, and comprises a hollow generally circular polymeric extrusion with the magnetisable or magnetised strip adjacent one face of the extrusion, the opposite face of which is connected to a U-shaped gripper for application to a flange around a door opening or door on the motor vehicle.
The present invention further provides a seal for sealing against a metal surface such as a refrigerator door, the seal being formed of a resiliently deformable polymeric material which carries a magnetised or magnetisable metallic strip at or adjacent one of its surfaces, the resiliently deformable polymeric material being extruded in one piece with the strip so as to be integral therewith.
The seal may be of any cross-sectional shape, and in one construction, the seal is of a generally rectangular cross-section and is suitable for a refrigerator door seal.
Preferably, the strip is of a ferrous metal which is located just below the surface and generally centrally along one of the longer faces of the seal. In this construction, the opposite face of the seal may be especially formed for connection to a surface, e.g. a refrigerator door or frame; for example, the opposite face may have a generally dove-tailed configuration for mating engagement in a re-entrant groove, for example in the frame or door or a refrigerator. Alternatively, the opposite face may be adapted for adhesively or otherwise securing the seal to the door or frame.
If desired, a further magnetisable metallic strip may be located just below the surface of the opposite face of
-3 10577~9 the seal, said further strip preferably being wider than the first-mentioned strip so that when magnetised it will adhere to the metallic surface of the door or frame with a greater adhesion than the first-mentioned strip. In an alternative construction, the seal comprises a continuously moulded polyurethane foam surrounded by a synthetic film, e.g. of polyethylene, with a magnetic or magnetisable strip located immediately within the synthetic film, on a surface of the foam.
In a further alternative construction, the seal may be of the type used in the automobile field for sealing around doors in motor vehicles, with the magnetisable or magnetised strip adjacent one face of a rubber extrusion, the opposite face of which is connected to a U-shaped gripper for application to a flange around a door opening or door on the motor vehicle.
An embodiment of the invention is now described by way of example with reference to the accompanying drawings, in which;-FIGURE 1 is a cross-section through one embodiment of seal, and FIGURES 2 - 5 are cross-sections through four other embodiments of seal.
Referring to Figure 1, an extruded refrigerator door seal is illustrated, the seal being formed of an elastomeric or plastics material 3 (which is shown as solid but could be cellular) and being generally of a rectangular configuration.
A ferrous metallic strip 5 is located just below the surface of one of the longer faces 7 of the seal, the width of the strip being about one-third of the width of the face 7. The opposite face 9 of the seal is specially formed with a dove-tailed portion 11 for engagement within a mating groove on the refrigerator door or refrigerator body.
1(~57'~9 In the construction illustrated in Figure 2, a rectangular seal body 13 is provided and a ferrous metallic strip l5 extends lengthwise of the seal just below the surface of one of the longer faces of the seal. A further ferrous metallic strip 19 is located just below the surface of the opposite face 21 of the seal, the width of the strip 19 being consideràbly greater than that of the strip 15.
~y this means the magnetic attraction of the strip 19 is greater than that of the strip 15 if the strips are magnetised to the same degree. It will be appreciated, however, that the magnetic attractio~ can be altered by ; changing the si~e of the strips, or the extent to which they are magnetised, or the distance of the strip beneath the surface of the qePl.
In an alternative embodiment, the construction shown in Pigure 2 can be manufactured without the strip 19 and the face 21 of the seal can then be adhesively secured ta the refrigerator door or body.
The se~l shown in Figure 3 is rectangular in cross-section, and formed principally of a continuously moulded polyurethane foam 21. A magnetisable metallic strip 23 is located on a longer ~urface of the foam 21 and a polyethylene ~ilm 25 then ~orms an impervious skin around the seal.
In ~he construction shown in Figure 4, a seal ~or the motor vehicle industry is illustrated. This seal comprises a generally U-shaped extrusion 27 of known construction, for application to a flange around a vehicle door or door opening, and a roundj hollow sealing portion 29, e.g. of foam rubber. A magnetic or magneti~able ctrip 31 i~ located just below the surface of the portion 29, 7~9 opposite the e~trusion 27. The extrusion 27 can be o~
rubber or plastics, and may be e~truded in one with the portion 29`, or the two parts may be adhesively or other~rise connected together.
By providing the magnetic strip 31 J an excellent seal between vehicle body and door can be achieved. Sometimes, because of manufacturing tolerances, an imperfect seal is obtai~ed with known sealing strips. However, the magnetic str~p 31 causes the sealing strip to be attracted towards the surface with which it must seal, and since the portion 29 is relatively soft, it can be caused by the magnetised strip 31 to deform very slightly, when necessary, to achieve a seal which might not otherwise have been achieved.
The embodiment shown in ~igure 5 is similar to that of ~igure 1, although in this embodiment, a magnetic strip 35 is located on the surface o~ the seal, and is locked in position in the body 37, (e.g. of PVC) of the seal by two stepped end portions 39.
In all the embodiments described above, it is necessary for the strips 7, 15, 19, 23, 31 or 39 to be permanently magnetised before the seals can be used. This magnetising operation can be performed in known manner, for example, by passing the seal through a magnetic field either immediately after the extrusion or profile forming operation or at a further work station. It might even be possible to magnetise the strip(s) before the profile forming operation.
It will be appreciated that the seals illustrated . .
herein and described above would normally be pre-formed,~
for example, into a rectangle, in known manner to suit lOS7785~
the precise shape and face of the refrigerator door, or motor vehicle, or whatever, for which they are designed. This forming operation can be performed either before or after the magnetising operation.
With the exception of the construction shown in Figure 3, the seals are extruded using our well-established crosshead extruding process.
Obviously, it is desirable for the metallic strip (which could be a wire) to be of a permanently magnetisable nature.
This can be achieved either by using a high nickel, cobalt alloy of steel or by using ordinary steel which then has a permanently magnetisable material sintered onto, or copper coated and then set onto, the surface of the steel. The whole strip can then be primed with an adhesive system using coil coating techniques in order to improve rubber to metal adhesion during curing after crosshead extruding.
The material for coating onto the surface of the strip, e.g. by sintering, may be that known under the Trade Mark FREOBAR available from Balfour Darwin of Tinsley, and the material for priming to improve the rubber to metal adhesion may be that known under the Trade Mark THIXON AP.1559. This is especially suitable for EPDM rubber.
By making our seals in one piece, i.e. the magnetic strip and polymeric material are integral, we can arrange for the gap between the magnetic strip and surface to be sealed to be very small, or zero. The obvious advantage is that we can obtain the same magnetic force of sealing with a weaker magnet than has been used in the past, which has cost and weight advantages.
In a further alternative construction, the seal may be of the type used in the automobile field for sealing around doors in motor vehicles, with the magnetisable or magnetised strip adjacent one face of a rubber extrusion, the opposite face of which is connected to a U-shaped gripper for application to a flange around a door opening or door on the motor vehicle.
An embodiment of the invention is now described by way of example with reference to the accompanying drawings, in which;-FIGURE 1 is a cross-section through one embodiment of seal, and FIGURES 2 - 5 are cross-sections through four other embodiments of seal.
Referring to Figure 1, an extruded refrigerator door seal is illustrated, the seal being formed of an elastomeric or plastics material 3 (which is shown as solid but could be cellular) and being generally of a rectangular configuration.
A ferrous metallic strip 5 is located just below the surface of one of the longer faces 7 of the seal, the width of the strip being about one-third of the width of the face 7. The opposite face 9 of the seal is specially formed with a dove-tailed portion 11 for engagement within a mating groove on the refrigerator door or refrigerator body.
1(~57'~9 In the construction illustrated in Figure 2, a rectangular seal body 13 is provided and a ferrous metallic strip l5 extends lengthwise of the seal just below the surface of one of the longer faces of the seal. A further ferrous metallic strip 19 is located just below the surface of the opposite face 21 of the seal, the width of the strip 19 being consideràbly greater than that of the strip 15.
~y this means the magnetic attraction of the strip 19 is greater than that of the strip 15 if the strips are magnetised to the same degree. It will be appreciated, however, that the magnetic attractio~ can be altered by ; changing the si~e of the strips, or the extent to which they are magnetised, or the distance of the strip beneath the surface of the qePl.
In an alternative embodiment, the construction shown in Pigure 2 can be manufactured without the strip 19 and the face 21 of the seal can then be adhesively secured ta the refrigerator door or body.
The se~l shown in Figure 3 is rectangular in cross-section, and formed principally of a continuously moulded polyurethane foam 21. A magnetisable metallic strip 23 is located on a longer ~urface of the foam 21 and a polyethylene ~ilm 25 then ~orms an impervious skin around the seal.
In ~he construction shown in Figure 4, a seal ~or the motor vehicle industry is illustrated. This seal comprises a generally U-shaped extrusion 27 of known construction, for application to a flange around a vehicle door or door opening, and a roundj hollow sealing portion 29, e.g. of foam rubber. A magnetic or magneti~able ctrip 31 i~ located just below the surface of the portion 29, 7~9 opposite the e~trusion 27. The extrusion 27 can be o~
rubber or plastics, and may be e~truded in one with the portion 29`, or the two parts may be adhesively or other~rise connected together.
By providing the magnetic strip 31 J an excellent seal between vehicle body and door can be achieved. Sometimes, because of manufacturing tolerances, an imperfect seal is obtai~ed with known sealing strips. However, the magnetic str~p 31 causes the sealing strip to be attracted towards the surface with which it must seal, and since the portion 29 is relatively soft, it can be caused by the magnetised strip 31 to deform very slightly, when necessary, to achieve a seal which might not otherwise have been achieved.
The embodiment shown in ~igure 5 is similar to that of ~igure 1, although in this embodiment, a magnetic strip 35 is located on the surface o~ the seal, and is locked in position in the body 37, (e.g. of PVC) of the seal by two stepped end portions 39.
In all the embodiments described above, it is necessary for the strips 7, 15, 19, 23, 31 or 39 to be permanently magnetised before the seals can be used. This magnetising operation can be performed in known manner, for example, by passing the seal through a magnetic field either immediately after the extrusion or profile forming operation or at a further work station. It might even be possible to magnetise the strip(s) before the profile forming operation.
It will be appreciated that the seals illustrated . .
herein and described above would normally be pre-formed,~
for example, into a rectangle, in known manner to suit lOS7785~
the precise shape and face of the refrigerator door, or motor vehicle, or whatever, for which they are designed. This forming operation can be performed either before or after the magnetising operation.
With the exception of the construction shown in Figure 3, the seals are extruded using our well-established crosshead extruding process.
Obviously, it is desirable for the metallic strip (which could be a wire) to be of a permanently magnetisable nature.
This can be achieved either by using a high nickel, cobalt alloy of steel or by using ordinary steel which then has a permanently magnetisable material sintered onto, or copper coated and then set onto, the surface of the steel. The whole strip can then be primed with an adhesive system using coil coating techniques in order to improve rubber to metal adhesion during curing after crosshead extruding.
The material for coating onto the surface of the strip, e.g. by sintering, may be that known under the Trade Mark FREOBAR available from Balfour Darwin of Tinsley, and the material for priming to improve the rubber to metal adhesion may be that known under the Trade Mark THIXON AP.1559. This is especially suitable for EPDM rubber.
By making our seals in one piece, i.e. the magnetic strip and polymeric material are integral, we can arrange for the gap between the magnetic strip and surface to be sealed to be very small, or zero. The obvious advantage is that we can obtain the same magnetic force of sealing with a weaker magnet than has been used in the past, which has cost and weight advantages.
Claims (15)
1. A method of manufacturing a magnetic seal, comprising the steps of:
extruding a resiliently deformable body of polymeric material around a magnetisable metallic strip;
arranging the strip relative to the body such that the metallic strip is located adjacent one peripheral surface of the body; and subsequently magnetising the metallic strip through said polymeric material.
extruding a resiliently deformable body of polymeric material around a magnetisable metallic strip;
arranging the strip relative to the body such that the metallic strip is located adjacent one peripheral surface of the body; and subsequently magnetising the metallic strip through said polymeric material.
2. A method according to claim 1 comprising the further step of cutting the strip to lengths subsequent to the magnetising step.
3. A method according to claim 1 which includes forming the body of polymeric material with a generally rectan-gular cross-section and locating the strip centrally along said one peripheral surface of the seal just below the surface.
4. A method according to claim 3 including the further step of arranging a second magnetisable strip relative to the body such that the second strip is located just below the opposite surface of the seal during the extrusion operation.
5. A seal for sealing against a metal surface such as a refrigerator door, the seal being formed of a resiliently deformable polymeric material which carries a magnetised or magnetisable metallic strip at or adjacent one of its surfaces, the resiliently deformable polymeric material being extruded in one piece with the strip so as to be integral therewith.
6. A seal as claimed in claim 5 which is of a generally rectangular cross-section and is suitable for a refrigerator door seal, the strip being totally encapsulated by the polyeric material.
7. A seal as claimed in claim 6 wherein the strip is of a ferrous metal which is located just below the surface.
8. A seal as claimed in claim 5, 6 or 7 wherein the strip is located generally centrally along one of the longer faces of the seal.
9. A seal as claimed in claim 6 wherein the strip is located on one of the longer faces of the seal, the ends of the strip being keyed into the body of polymeric material.
10. A seal as claimed in claim 7 wherein the opposite face of the seal is especially formed for connection to a surface.
11. A seal as claimed in claim 10 wherein the opposite face has a generally dove-tailed configuration for mating engagement in a re-entrant groove.
12. A seal as claimed in claim 6 wherein a further magnetisable metallic strip is located just below the surface of the opposite face of the seal.
13. A seal as claimed in claim 12 wherein said further strip is wider than the first-mentioned strip so that when magnetised it will adhere to a metallic surface with a greater adhesion than the first-mentioned strip.
14. A seal as claimed in claim 5, 6 or 7 wherein the polymeric material comprises a continuously moulded poly-urethane foam surrounded by a synthetic film, the strip being located immediately within the synthetic film on a surface of the foam.
15. A seal as claimed in claim 1, which is of a type used in the automobile field for sealing around doors in motor vehicles, and comprises a hollow generally circular poly-meric extrusion with the magnetisable or magnetised strip adjacent one face of the extrusion, the opposite face of which is connected to a U-shaped gripper for application to a flange around a door opening or door on the motor vehicle.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1462176A GB1554941A (en) | 1976-04-09 | 1976-04-09 | Extruded sealing strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1057789A true CA1057789A (en) | 1979-07-03 |
Family
ID=10044564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,753A Expired CA1057789A (en) | 1976-04-09 | 1977-04-06 | Extruded sealing strip |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1057789A (en) |
| DE (1) | DE2715902A1 (en) |
| GB (1) | GB1554941A (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10208058B4 (en) * | 2002-02-25 | 2018-10-25 | BSH Hausgeräte GmbH | The refrigerator |
| US4484161A (en) * | 1982-05-24 | 1984-11-20 | Varian Associates, Inc. | Silicone rubber for relieving stress in magnetic material |
| DE3405973A1 (en) * | 1984-02-18 | 1985-08-22 | Continental Gummi-Werke Ag, 3000 Hannover | METHOD FOR PRODUCING SEALING STRIPS AND SIMILAR PROFILE STRINGS FROM RUBBER AND RUBBER-LIKE ELASTOMERS |
| DE3708176C1 (en) * | 1987-03-13 | 1988-11-10 | Harry Frey | Magnetic door seal |
| DE8816745U1 (en) * | 1988-02-06 | 1990-07-05 | Fa. F. Athmer, 5760 Arnsberg, De | |
| DE19700886A1 (en) * | 1997-01-14 | 1998-07-16 | Dorma Gmbh & Co Kg | Shower partition |
| EP0971187A1 (en) * | 1998-07-08 | 2000-01-12 | Liebherr-Hausgeräte Gmbh | Refrigerator with sensor for recording the opening of the door |
| DE29816030U1 (en) * | 1998-09-07 | 2000-01-20 | Niemann Hans Dieter | Building completion, especially door or window |
| WO2001022015A1 (en) * | 1999-09-23 | 2001-03-29 | Industrie Ilpea S.P.A. | Sealing gasket with magnetic closure, particularly for door wings, hatches, windows and doors and the like and method for its realisation |
| FR2845749B1 (en) * | 2002-10-09 | 2005-01-21 | Saint Gobain | SEAL AND INSULATING GLAZING INCORPORATING THIS SEAL |
| FR2845750B1 (en) | 2002-10-09 | 2005-04-29 | Saint Gobain | SEAL AND INSULATING GLAZING INCORPORATING THIS SEAL |
| DE10345919B4 (en) * | 2003-10-02 | 2009-11-05 | Lämmermann, Gerd | Insect screen door or window |
| DE202006008136U1 (en) * | 2006-05-19 | 2006-07-20 | Rehau Ag + Co | Sealing profile with magnet e.g. for shower cabin doors, has mounting element and soft seal part, which contain polymer-bound magnetic strip PVC components and magnetic strip joined and connected by coextrusion work tool |
| DE102008042138A1 (en) | 2008-09-16 | 2010-03-18 | Audi Ag | Sealing system for sealing opening i.e. door, of motor vehicle, has current loading coil changing magnetic field in electromagnetic co-activation with magnetizable particle during variation of current flow in coil |
| DE202013102717U1 (en) * | 2013-06-24 | 2014-09-25 | Rehau Ag + Co. | extrusion profile |
| CN104441478A (en) * | 2014-11-10 | 2015-03-25 | 桐乡市佳盛塑料制品有限公司 | Novel door stopper and injection mold thereof |
| CN108915553B (en) * | 2018-08-28 | 2024-04-12 | 虫极科技（北京）有限公司 | Intelligent container and sealing structure thereof |
-
1976
- 1976-04-09 GB GB1462176A patent/GB1554941A/en not_active Expired
-
1977
- 1977-04-06 CA CA275,753A patent/CA1057789A/en not_active Expired
- 1977-04-09 DE DE19772715902 patent/DE2715902A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB1554941A (en) | 1979-10-31 |
| DE2715902A1 (en) | 1977-10-20 |
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