Patent US5230963A successfully refreshed from Google Patents.
US5230963A
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Oxygen and water vapor transmission resistant film and method
Assignee: Mobil Oil AS
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Filing: 1991-12-20
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Granted: 1993-07-27
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Expires: 2011-12-20
Abstract
Abstract A multilayer film combination has a pair of base layers each of a blend of polypropylene and maleated polypropylene, each is machine direction oriented before receiving a coating of PVOH containing a cross-linking agent and each is mated with the PVOH coatings together before the combination is transverse direction oriented.
Inventors
- 👤 Anthony R. Knoerzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:21
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B29C55/026; B32; B32B; B32B27/00; B32B27/32; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/048; C08J7/052; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2029/00; B29K2029/04; C08J2323/00; C08J2323/02; C08J2323/10; C08J2429/00; C08L51/00; C08L51/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A film combination comprising (a) a pair of films each comprised of an intimate blend of polypropylene and a maleic acid anhydride modified polypropylene, (b) coatings of poly(vinyl alcohol) containing cross-linking means having been applied to a surface of each of said pair while said pair had been in a machine direction orientation condition and (c); each coated film having been positioned with the poly(vinyl alcohol) layers in intimate contacting relationship while said coated contacting films had been transverse direction oriented.
Claim 2
Dependent Claim
81 words
A film combination comprising (a) a pair of films each comprised of an intimate blend of polypropylene and a maleic acid anhydride modified polypropylene, (b) coatings of poly(vinyl alcohol) containing cross-linking means having been applied to a surface of each of said pair while said pair had been in a machine direction orientation condition and (c); each coated film having been positioned with the poly(vinyl alcohol) layers in intimate contacting relationship while said coated contacting films had been transverse direction oriented.
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) | 1996-07-26 | 1997-01-25 | 1997-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-26 | 2001-01-25 | 2001-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-26 | 2005-01-25 | 2005-07-27 | $7700.00 | Window Closed / Lapsed |