US4828928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monoaxial shrink film
Assignee: Cryovac LLC
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Filing: 1986-12-17
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Granted: 1989-05-09
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Expires: 2006-12-17
Abstract
Abstract A coextruded multiple layer film is oriented in primarily the longitudinal direction, and comprises a core layer comprising high density polyethylene, outer layers comprising ethylene propylene copolymer, polypropylene, or blends thereof, and intermediate layers which bond the outer layers to the cure layer and comprise an ethylene copolymer.
Inventors
- 👤 Gautam P. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:52
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/10; B32B2331/00; B32B2331/04; B32B2333/00; B32B2333/04; B32B2333/08; B32B2519/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/28; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
A shrink film, oriented in primarily one direction, comprising: (a) a cross-linked core layer comprising a high density polyethylene; (b) two cross-linked outer layers each comprising ethylene propylene copolymer, polypropylene, or blends thereof; and (c) two cross-linked intermediate layers each bonding the core layer to a respective outer layer and comprising an ethylene copolymer selected from the group consisting of ethylene vinyl acetate copolymer, ethylene alkyl acrylate copolymer, ethylene alpha-olefin copolymer, and chemically modified derivatives of any of said ethylene copolymers and containing carboxylic acid or acid anhydrides.
Claim 2
Dependent Claim
88 words
A shrink film, oriented in primarily one direction, comprising: (a) a cross-linked core layer comprising a high density polyethylene; (b) two cross-linked outer layers each comprising ethylene propylene copolymer, polypropylene, or blends thereof; and (c) two cross-linked intermediate layers each bonding the core layer to a respective outer layer and comprising an ethylene copolymer selected from the group consisting of ethylene vinyl acetate copolymer, ethylene alkyl acrylate copolymer, ethylene alpha-olefin copolymer, and chemically modified derivatives of any of said ethylene copolymers and containing carboxylic acid or acid anhydrides.
Claim 3
Dependent Claim
28 words
The film according to claim 1 wherein the outer layers each comprise a blend of about 5% to 95% ethylene propylene copolymer, and about 95% to 5% polypropylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |