US4190477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pouch
Assignee: Rexam Beverage Can Co
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Filing: 1978-05-01
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Granted: 1980-02-26
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Expires: 1998-05-01
Abstract
Abstract A hermetically sealed pouch, being safe for the storage of foods, avoiding giving a taste to enclosed food, the filled pouch being able to withstand cooking temperatures typically used to cook food.
Inventors
- 👤 William F. Ossian
- 👤 Thomas S. Wildenberg
- 👤 Henry Warmbier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:58
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/085; B29; B29C; B29C43/00; B29C43/22; B32B27/00; B32B27/32; B32B37/00; B32B37/06; B32B38/00; B32B38/0036; B32B38/004; B32B2323/00; B32B2323/10; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1338; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A method of making a multiply laminated structure comprising an inside sealing layer containing polypropylene and an outer metal foil layer, which method comprises: (a) applying a primer layer to said metal foil, said primer layer being a graft copolymer of maleic anhydride and propylene wherein the maleic anhydride moieties are grafted onto a polypropylene backbone; (b) drawing said primed metal foil laminate and said sealing layer in face-to-face relation into the nip defined by a pair of rollers; and (c) simultaneously drawing a hot layer of extrusion grade polypropylene into said nip between said sealing layer and primer layer to thereby laminate said sealing layer to said primer layer.
Claim 2
Independent Claim
110 words
A method of making a multiply laminated structure comprising an inside sealing layer containing polypropylene and an outer metal foil layer, which method comprises: (a) applying a primer layer to said metal foil, said primer layer being a graft copolymer of maleic anhydride and propylene wherein the maleic anhydride moieties are grafted onto a polypropylene backbone; (b) drawing said primed metal foil laminate and said sealing layer in face-to-face relation into the nip defined by a pair of rollers; and (c) simultaneously drawing a hot layer of extrusion grade polypropylene into said nip between said sealing layer and primer layer to thereby laminate said sealing layer to said primer layer.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said extrusion grade polypropylene layer is at a temperature between about 540° F. and about 640° F.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the temperature of one of said rollers is controlled.
Claim 5
Dependent Claim
15 words
The method of claim 2 wherein the temperature of one of said rollers is controlled.
Claim 6
Dependent Claim
22 words
The method of claim 2 wherein one of said rollers is chilled below the temperature of said layer of extrusion grade polypropylene.
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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |