US3840680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon dioxide generating foodstuff package with polyethyleneimine layer composite plastic foil
Assignee: Lever Brothers Co
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Filing: 1972-03-28
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Granted: 1974-10-08
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Expires: 1992-03-28
Abstract
Abstract 1. AN IMPROVED COMPOSITE PLASTIC FOIL CONTAINING A GAS-IMPERMEABLE LAYER, A LAYER PERMEABLE TO CARBON DIOXIDE AND AN INTERMEDIATE ADHERSIVE LAYER CONSISTING ESSENTIALLY OF POLYETHYLENIMINE WITH AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 3000 AND A C:N RATIO OF ABOUT 2 TO ABOUT 2.7, WHEREIN THE IMPROVEMENT COMPRISES AN INTERMEDIATE LAYER AT WHICH THE AMOUNT OF POLYETHYLENEIMINE IS FROM ABOUT 0.2 TO ABOUT 10 G./M.2 OF THE COMPOSITE PLASTIC FOIL.
Inventors
- 👤 H Schmidt
- 👤 D Stoltzenberg
- 👤 V Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:47
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; A; A23; A23C; A23C19/00; A23C19/14; A23C19/16; A23C19/166; B32B27/00; B32B27/06; B32B27/08; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
AN IMPROVED COMPOSITE PLASTIC FOIL CONTAINING A GAS-IMPERMEABLE LAYER, A LAYER PERMEABLE TO CARBON DIOXIDE AND AN INTERMEDIATE ADHERSIVE LAYER CONSISTING ESSENTIALLY OF POLYETHYLENIMINE WITH AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 3000 AND A C:N RATIO OF ABOUT 2 TO ABOUT 2.7, WHEREIN THE IMPROVEMENT COMPRISES AN INTERMEDIATE LAYER AT WHICH THE AMOUNT OF POLYETHYLENEIMINE IS FROM ABOUT 0.2 TO ABOUT 10 G./M.2 OF THE COMPOSITE PLASTIC FOIL.
Claim 2
Dependent Claim
70 words
AN IMPROVED COMPOSITE PLASTIC FOIL CONTAINING A GAS-IMPERMEABLE LAYER, A LAYER PERMEABLE TO CARBON DIOXIDE AND AN INTERMEDIATE ADHERSIVE LAYER CONSISTING ESSENTIALLY OF POLYETHYLENIMINE WITH AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 3000 AND A C:N RATIO OF ABOUT 2 TO ABOUT 2.7, WHEREIN THE IMPROVEMENT COMPRISES AN INTERMEDIATE LAYER AT WHICH THE AMOUNT OF POLYETHYLENEIMINE IS FROM ABOUT 0.2 TO ABOUT 10 G./M.2 OF THE COMPOSITE PLASTIC FOIL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |