US4357376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer film for primal meat packaging
Assignee: Viskase Corp
•
Filing: 1981-07-06
•
Granted: 1982-11-02
•
Expires: 2001-07-06
Abstract
Abstract A heat-shrinkable multilayer film suitable for use in the packaging of primal meat cuts wherein the first outer layer comprises a blend of ethylene-vinyl acetate copolymer, propylene-ethylene copolymer, and 1-butene-ethylene copolymer; a core layer comprising a vinylidene chloride-vinyl chloride copolymer; and a second outer layer comprising an ethylene-vinyl acetate copolymer.
Inventors
- 👤 Bruce E. Nattinger
- 👤 Stephen J. Vicik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10788; B32B2331/00; B32B2331/04; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
116 words
A flexible heat-shrinkable multilayer film suitable for packaging a primal red meat cut, said multilayer film including a first outer layer comprising a blend of ethylene-vinyl acetate copolymer, propylene-ethylene copolymer, and 1-butene-ethylene copolymer; a core layer comprising a vinylidene chloride-vinyl chloride copolymer; and a second outer layer comprising an ethylene-vinyl acetate copolymer; said first outer layer containing from between about twenty percent and about eighty percent by weight of said ethylene-vinyl acetate copolymer, from between about ten percent and about forty percent by weight of said propylene-ethylene copolymer, and from between about ten percent and about forty percent by weight of said 1-butene-ethylene copolymer, all weight percentages based on the weight of said first outer layer.
Claim 2
Dependent Claim
116 words
A flexible heat-shrinkable multilayer film suitable for packaging a primal red meat cut, said multilayer film including a first outer layer comprising a blend of ethylene-vinyl acetate copolymer, propylene-ethylene copolymer, and 1-butene-ethylene copolymer; a core layer comprising a vinylidene chloride-vinyl chloride copolymer; and a second outer layer comprising an ethylene-vinyl acetate copolymer; said first outer layer containing from between about twenty percent and about eighty percent by weight of said ethylene-vinyl acetate copolymer, from between about ten percent and about forty percent by weight of said propylene-ethylene copolymer, and from between about ten percent and about forty percent by weight of said 1-butene-ethylene copolymer, all weight percentages based on the weight of said first outer layer.
Claim 3
Dependent Claim
53 words
A multilayer film as in claim 1 wherein said first outer layer contains about fifty percent by weight of said ethylene-vinyl acetate copolymer, about twenty-five percent by weight of said propylene-ethylene copolymer and about twenty-five percent by weight of said 1-butene-ethylene copolymer, all weight percentages based on the weight of said outer layer.
Claim 4
Dependent Claim
40 words
A multilayer film as in claim 1 wherein said ethylene-vinyl acetate copolymer of said first outer layer contains between about eight percent and about sixteen percent by weight of vinyl acetate based on the weight of said ethylene-vinyl acetate copolymer.
Claim 5
Dependent Claim
25 words
A multilayer film as in claim 3 wherein said ethylene-vinyl acetate copolymer has a melt index of between about 0.1 and 11.0 decigrams per minute.
Claim 6
Dependent Claim
32 words
A multilayer film as in claim 1 wherein said propylene-ethylene copolymer contains between about one percent and about ten percent by weight of ethylene based on the weight of said propylene-ethylene copolymer.
Claim 7
Dependent Claim
28 words
A multilayer film as in claim 5 wherein said propylene-ethylene copolymer has a melt flow at 230° C. of between about 2 and about 12 decigrams per minute.
Claim 8
Dependent Claim
32 words
A multilayer film as in claim 1 wherein said 1-butene-ethylene copolymer contains between about two percent and about ten percent by weight of ethylene based on the weight of said 1-butene-ethylene copolymer.
Claim 9
Dependent Claim
25 words
A multilayer film as in claim 7 wherein said 1-butene-ethylene copolymer has a melt index of between about 0.1 and about 3.0 decigrams per minute.
Claim 10
Dependent Claim
52 words
A multilayer film as in claim 1 wherein said vinylidene chloride-vinyl chloride copolymer contains between about sixty-five percent and about ninety percent by weight of polymerized polyvinylidene chloride and between about ten percent and about thirty-five percent by weight of vinyl chloride based on the weight of said vinylidene chloride-vinyl chloride copolymer.
Claim 11
Dependent Claim
33 words
A multilayer film as in claim 1 wherein said second outer layer comprises an ethylene-vinyl acetate copolymer containing about twelve percent by weight of vinyl acetate based on the weight of said copolymer.
Claim 12
Dependent Claim
27 words
A multilayer film as in claim 10 wherein said ethylene-vinyl acetate copolymer has a melt index of between about 0.1 decigrams and about 1.0 decigrams per minute.
Claim 13
Dependent Claim
12 words
A primal meat bag formed from the multilayer film of claim 1.
Claim 14
Dependent Claim
56 words
A multilayer film as in claim 1 wherein said first outer layer has a thickness of between about 0.2 mils and about 0.7 mils, said core layer has a thickness of between about 0.2 mils and about 0.7 mils, and said second outer layer has a thickness of between about 1.0 mil and about 3.2 mils.
Claim 15
Dependent Claim
12 words
A primal meat bag formed from the multilayer film of claim 13.
Claim 16
Dependent Claim
12 words
A primal meat bag formed from the multilayer film of claim 14.
References Cited (Backward Citations)
US3821182A
Cited
US4048428A
Cited
US4112181A
Cited
US4031162A
Cited
US3817821A
Cited
JPS5337784A
Cited
US4207363A
Cited
US4247584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |