US4629657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially oriented polypropylene film construction for special lamination
Assignee: NORTHERN PETROCHEMICAL Co
•
Filing: 1982-12-13
•
Granted: 1986-12-16
•
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 00:45
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.
References Cited (Backward Citations)
US3088844A
Cited
US3285766A
Cited
US3194872A
Cited
US3442687A
Cited
US3496061A
Cited
US3505143A
Cited
US3519531A
Cited
US4045607A
Cited
US3823747A
Cited
US3963851A
Cited
US4132857A
Cited
US4051280A
Cited
US4125662A
Cited
JPS5530950A
Cited
JPS55133959A
Cited
US4360550A
Cited
US4275120A
Cited
US4257536A
Cited
US4335175A
Cited
US4363841A
Cited
US4407874A
Cited
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 |