Patent US4085244A successfully refreshed from Google Patents.
US4085244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced orientated flexible packaging composite
Assignee: Rexam Beverage Can Co
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Filing: 1976-02-10
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Granted: 1978-04-18
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Expires: 1996-02-10
Abstract
Abstract A laminated packaging film is disclosed. This film composed, in order, of an outer layer of balanced biaxially-oriented polyamide, a flexible metal foil, a layer of balanced biaxially-oriented polypropylene and an inner layer of heat-sealable polyolefin -- is readily produced and yields an exceptionally strong and flex-resistant laminate useful inter alia for the production of pouches and like, liquid containers of large volume.
Inventors
- 👤 Nathan Stillman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:32
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/085; B32B15/088; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/34; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/04; B32B2323/10; B32B2377/00; B32B2439/00; Y; Y10; Y10S; Y10S383/00; Y10S383/908; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1338; Y10T428/24; Y10T428/24777; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31587; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A composite, flexible packaging film comprising essentially a first layer of balanced-oriented polyamide, providing substantially flex-crack resistance, affixed to one side of a second layer of flexible metal foil and a third layer of balanced biaxially-oriented polypropylene, also providing substantially flex-crack resistance, affixed to the opposite side of said foil and to a fourth layer of heat-sealable polyolefin.
Claim 2
Dependent Claim
58 words
A composite, flexible packaging film comprising essentially a first layer of balanced-oriented polyamide, providing substantially flex-crack resistance, affixed to one side of a second layer of flexible metal foil and a third layer of balanced biaxially-oriented polypropylene, also providing substantially flex-crack resistance, affixed to the opposite side of said foil and to a fourth layer of heat-sealable polyolefin.
Claim 3
Dependent Claim
11 words
The film of claim 1, wherein the polyolefin layer comprises polyethylene.
Claim 4
Dependent Claim
19 words
The film of claim 2, wherein the polyethylene has a melting point of from about 70° to 90° C.
Claim 5
Dependent Claim
23 words
The film of claim 1, wherein the balanced biaxially-oriented polypropylene and polyethylene layers are affixed together through an intermediate layer of adhesive resin.
Claim 6
Dependent Claim
11 words
The film of claim 4, wherein the adhesive resin is polyurethane.
Claim 7
Dependent Claim
36 words
The film of claim 1, wherein the foil is provided with a vinyl washcoat on the side adjacent the balanced biaxially-oriented polypropylene layer and is affixed to said polypropylene layer through a layer of adhesive resin.
Claim 8
Dependent Claim
11 words
The film of claim 6, wherein the adhesive resin comprises polyurethane.
Claim 9
Dependent Claim
39 words
The film of claim 1, wherein the balanced biaxially-oriented polyamide layer is provided with a primer coat of polyethylene imine on the side adjacent the metal foil and is affixed to said foil through a layer of adhesive resin.
Claim 10
Dependent Claim
14 words
The film of claim 8, wherein the adhesive resin comprises ethylene vinyl acetate copolymer.
Claim 11
Dependent Claim
44 words
A flexible pouch composed essentially of the film of claim 1, said pouch being self-sealed through the fourth layer of heat-sealable polyolefin at overlapping edge portions of said film so as to define an internal pouch cavity of at least 5 liters in volume.
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |