Patent USRE31137E successfully refreshed from Google Patents.
USRE31137E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pouch
Assignee: Rexam Beverage Can Co
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Filing: 1981-01-22
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Granted: 1983-02-01
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Expires: 2001-01-22
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
2026-11-07 22:03
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
177 words
The method of claim 2 wherein one of said rollers is chilled below the temperature of said layer of extrusion grade polypropylene. .Iadd. 6. 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-face relation into the nip defined by a pair of rollers; and (c) simultaneously drawing a hot layer of extrusion grade polymer containing polypropylene into said nip between said sealing layer and primer layer to thereby laminate said sealing layer to said primer layer. .Iaddend..Iadd. 7. The method of claim 6 wherein said extrusion grade polymer in step (c) contains a polypropylene polyethylene blend. .Iaddend..Iadd. 8. The method of claim 6 wherein said extrusion grade polymer in step (c) contains a polypropylene polyethylene copolymer. .Iaddend.
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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |