US3663240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package and method of making same
Assignee: Oscar Mayer Foods Corp
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Filing: 1969-03-24
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Granted: 1972-05-16
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Expires: 1989-03-24
Abstract
Abstract A hermetically sealed package material and method of making the same which includes a breakaway or peelable seal formed between first and second layers of packaging materials. The first layer of packaging material includes a backing member, preferably formed from lightweight paper stock, which is bonded to a saran film or coating while in a supercooled state by a suitable adhesive, such as, for example, an adhesive selected from the group consisting of styrene-butadiene latex compounds, vinyl printing inks, ethylene-vinyl acetate latex compounds, acrylonitrile-vinylidene chloride copolymers and other adhesive compounds exhibiting equivalent bonding characteristics with saran type films. The second layer of packaging material is formed from an ethylene-polar monomer copolymer film or coating material, such as, for example, an ethylene-vinyl acetate film, which is bonded to a suitable oxygen barrier material such as, for example, an oxygen barrier saran film. The peelable or breakaway seal is formed between the saran film or coating of the first layer of packaging material and the ethylene-polar monomer copolymer film or coating of the second layer of packaging film.
Inventors
- 👤 Oscar E Seiferth
- 👤 Paul E Grindrod
- 👤 Maurice J Gifford
- 👤 Glenn M Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/28; B65D75/30; B65D75/305; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
30 words
The package of claim 1 wherein said polar monomer of said ethylene-polar monomer copolymer film material is selected from the group consisting of vinyl acetate, isobutyl acrylate and ethyl acrylate.
Claim 2
Dependent Claim
39 words
The package of claim 1 wherein said seal forming surface of said second layer of packaging material is composed of ethylene-vinyl acetate copolymer film material having a vinyl acetate content of from about 15 to 20 percent by weight.
Claim 3
Dependent Claim
13 words
The package of claim 1 wherein said backing member is formed of paper.
Claim 4
Dependent Claim
35 words
The package of claim 1 wherein said hermetic seal was heated to a temperature of from 80* to 200* F. at the time said ethylene-polar monomer copolymer material was adhered to said saran film material.
Claim 5
Dependent Claim
204 words
In a package wherein a meat product is enclosed between first and second layers of packaging material, said package having an improved hermetic breakaway or peelable seal defined between respective sealing surfaces at first and second layers of said packaging material in contact with each other, said seal forming surface of said first layer of packaging material being composed of a saran film which is bonded to a backing member, and said seal forming surface of said second layer of packaging material being composed of an ethylene-polar monomer copolymer film material having a polar monomer content of approximately 10 to 40 percent by weight which is bonded to an oxygen barrier film, the improvement wherein said saran film is bonded to said backing member while in a super-cooled state by an adhesive which is selected from the group consisting of styrene-butadiene latex compounds, vinyl printing inks, ethylene vinyl acetate latex compounds, and acrylonitrile-vinylidene chloride copolymers, said saran film having been initially contacted with said ethylene-polar monomer copolymer film material to form said hermetic seal while being maintained in a supercooled state, whereby said package is characterized by an improved hermetic seal which can be readily separated when access to said meat product is desired.
Claim 6
Dependent Claim
30 words
The package of claim 6 wherein said polar monomer in said ethylene-polar monomer copolymer film material is selected from the group consisting of vinyl acetate, isobutyl acrylate and ethyl acrylate.
Claim 7
Dependent Claim
31 words
The package of claim 6 wherein said ethylene-polar monomer copolymer film material is an ethylene-vinyl acetate copolymer film wherein the vinyl acetate content is from 15 to 20 percent by weight.
Claim 8
Independent Claim
181 words
A method of enclosing a product between a pair of packaging materials which can be readily separated when access to said product is desired, said method comprising the steps of inserting a product between first and second layers of packaging material, said first layer of packaging material having a lamina adjacent said product which is formed of a saran film, said saran film being bonded while in a supercooled state to a backing member by an adhesive selected from the group consisting of styrene-butadiene latex compounds, vinyl printing inks, ethylene-vinyl acetate latex compounds and acrylonitrile-vinylidene chloride copolymers, said second layer of packaging material having a lamina adjacent said product which is formed of an ethylene-polaR monomer copolymer film material having a polar monomer content of from 10 to 40 percent by weight, said second layer of packaging material having an outer lamina formed of an oxygen barrier film, contacting said saran lamina with said ethylene-polar monomer copolymer film material about said product to form a hermetic seal which completely encloses said product between said first and second layers of packaging material.
Claim 9
Dependent Claim
35 words
The method of claim 9 wherein said saran lamina and said ethylene-polar monomer copolymer film lamina are heated to a temperature of from about 80* to 200* F. at the time of forming said seal.
Claim 10
Dependent Claim
14 words
The method of claim 9 wherein said backing member is supplied from a web.
Claim 11
Dependent Claim
31 words
The method of claim 11 wherein said web of backing material is contacted with said saran film in a supercooling bath maintained at a temperature of from 30* to 100* F.
Claim 12
Dependent Claim
40 words
The method of claim 11 wherein said web of backing material is contacted with said supercooled saran immediately after said saran film leaves a supercooling bath and prior to the time that it is placed in contact with said product.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |