Patent US4629657A successfully refreshed from Google Patents.
US4629657A
Expired / Lapsed
US
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Biaxially oriented polypropylene film construction for special lamination
Assignee: NORTHERN PETROCHEMICAL Co
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Filing: 1982-12-13
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Granted: 1986-12-16
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Expires: 2002-12-13
Abstract
Abstract A film construction is disclosed which comprises a base layer of biaxially oriented polypropylene, a top layer of a copolymer of ethylene and an unsaturated carboxylic acid, and a bottom layer selected from the group consisting of copolymers of ethylene and an unsaturated acid, copolymers of ethylene and propylene, copolymers of ethylene and vinyl acetate, and ionomers of ethylene and methacrylic acid.
Inventors
- 👤 Sujan C. Gulati
- 👤 Edward C. Enderle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:38
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B15/00; B32B15/04; B32B15/08; B32B27/06; B32B27/08; B32B27/10; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31909
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A film construction formed by a one step thermal lamination process, comprising: (a) A base layer of biaxially oriented polypropylene, (b) A top layer of a copolymer of ethylene and an unsaturated carboxylic acid, and (c) A bottom layer selected from the group consisting of copolymers of ethylene and an unsaturated carboxylic acid, copolymers of ethylene and propylene, copolymers of ethylene and vinyl acetate, and ionomers of ethylene and methacrylic acid, wherein one of the layers are coated with an adhesive material.
Claim 2
Dependent Claim
82 words
A film construction formed by a one step thermal lamination process, comprising: (a) A base layer of biaxially oriented polypropylene, (b) A top layer of a copolymer of ethylene and an unsaturated carboxylic acid, and (c) A bottom layer selected from the group consisting of copolymers of ethylene and an unsaturated carboxylic acid, copolymers of ethylene and propylene, copolymers of ethylene and vinyl acetate, and ionomers of ethylene and methacrylic acid, wherein one of the layers are coated with an adhesive material.
Claim 3
Dependent Claim
30 words
The film construction of claim 1 wherein the thickness of the layer of copolymer of ethylene and an unsaturated carboxylic acid is from about 0.02 mils to about 0.2 mils.
Claim 4
Dependent Claim
18 words
The film construction of claim 2 wherein said thickness is from about 0.02 mils to about 0.08 mils.
Claim 5
Dependent Claim
16 words
The film construction of claim 1 wherein the top layer is bonded to a metal layer.
Claim 6
Dependent Claim
29 words
The film construction of claim 4 wherein the bottom layer is a copolymer of ethylene and an unsaturated carboxylic acid and it is also bonded to a metal layer.
Claim 7
Dependent Claim
14 words
The film construction of claim 1 wherein the top layer is bonded to paper.
Claim 8
Dependent Claim
17 words
The film construction of claim 1 wherein the top layer is made of ethylene acrylic acid copolymer.
Claim 9
Dependent Claim
17 words
The film construction of claim 7 wherein the bottom layer is made of ethylene acrylic acid copolymer.
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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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |