Patent US4939076A successfully refreshed from Google Patents.
US4939076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barrier stretch film
Assignee: Cryovac LLC
•
Filing: 1988-07-26
•
Granted: 1990-07-03
•
Expires: 2008-07-26
Abstract
Abstract A barrier stretch film comprises an outer layer of a heat sealable polymeric material; a first interior layer of an oxygen barrier polymeric material; a second interior layer of a high molecular weight polymer; an inner copolyamide layer; and an adhesive between the second interior and inner layers.
Inventors
- 👤 Walter B. Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:24
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/34; B65; B65D; B65D65/00; B65D65/38; B65D65/40; B65D85/00; B65D85/30; B65D85/38; B65D85/40; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
A barrier stretch film comprising: (a) an outer layer comprising a heat sealable polymeric material selected from the group consisting of ethylene vinyl acetate copolymer, ethylene butyl acrylate copolymer, linear low density polyethylene, and polyester; (b) a first interior layer comprising an oxygen barrier polymeric material; (c) a second interior layer comprising a high molecular weight polymeric material; (d) an inner layer comprising a copolyamide, and (e) a polymeric adhesive disposed between the second interior and inner layers; wherein said film is a lay-flat tubular film having its interior lay-flat surfaces self-welded.
Claim 2
Dependent Claim
92 words
A barrier stretch film comprising: (a) an outer layer comprising a heat sealable polymeric material selected from the group consisting of ethylene vinyl acetate copolymer, ethylene butyl acrylate copolymer, linear low density polyethylene, and polyester; (b) a first interior layer comprising an oxygen barrier polymeric material; (c) a second interior layer comprising a high molecular weight polymeric material; (d) an inner layer comprising a copolyamide, and (e) a polymeric adhesive disposed between the second interior and inner layers; wherein said film is a lay-flat tubular film having its interior lay-flat surfaces self-welded.
Claim 3
Dependent Claim
31 words
A film according to claim 1 wherein the first interior layer comprises an oxygen barrier polymeric material selected from the group consisting of vinylidene chloride copolymer, and ethylene vinyl alcohol copoylmer.
Claim 4
Dependent Claim
17 words
A film according to claim 2 wherein the oxygen barrier polymeric material comprises unplasticized vinylidene chloride copolymer.
Claim 5
Dependent Claim
42 words
A film according to claim 1 wherein the second interior layer comprises a polymeric material of high molecular weight selected from the group consisting of ethylene vinyl acetate copolymer, ethylene butyl acrylate copolymer, linear low density polyethylene, and very low density polyethylene.
Claim 6
Dependent Claim
15 words
A film according to claim 1 wherein the polymeric adhesive comprises a chemically modified polyolefin.
Claim 7
Dependent Claim
87 words
A barrier stretch film according to claim 1 further comprising a second film, bonded to one surface of said barrier stretch film, comprising a polymeric material selected from the group consisting of: (a) oriented polyester, (b) oriented nylon, (c) a multilayer film having an outer layer of propylene homopolymer or copolymer and an inner bonding layer of ethylene vinyl acetate copolymer, and (d) a biaxially oriented stretch film having exterior and core layers of ethylene vinyl acetate copolymer, and two intermediate layers of linear low density polyethylene.
References Cited (Backward Citations)
US4064296A
Cited
US4226822A
Cited
JPS5416582A
Cited
US4399180A
Cited
US4390587A
Cited
US4376799A
Cited
EP0062822A2
Cited
US4486507A
Cited
US4352844A
Cited
US4457960A
Cited
US4442147A
Cited
US4568580A
Cited
US4578294A
Cited
US4542075A
Cited
US4557780A
Cited
US4617241A
Cited
US4696865A
Cited
US4721654A
Cited
US4801486A
Cited
US4800129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |