Patent US3671356A successfully refreshed from Google Patents.
US3671356A
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Method of forming a peelable seal between propylene polymer and a carboxylated polypropylene coated surface
Assignee: Continental Can Co Inc
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Filing: 1970-06-08
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Granted: 1972-06-20
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Expires: 1990-06-08
Abstract
Abstract A CLEANLY SEPARABLE SEAL BETWEEN A PROPYLENE POLYMER LAYER HEAT SEALED TO A SURFACE COATED WITH A CARBOXYL MODIFIED POLYPROPYLENE CONTAINING LAYER IS OBTAINED BY TREATING AT LEAST ONE OF THE LAYERS TO BE SEALED WITH A NORMALLY SOLID THERMOPLASTIC VINYL AROMATIC POLYMER OR A POLR POLYMER BEFORE THE TWO LAYERS ARE HEAT SEALED TOGETHER.
Inventors
- 👤 Henry J Keinanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:29
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/50; B65D17/501; B65D17/502; B65D2517/00; B65D2517/0001; B65D2517/001; B65D2517/0013; B65D2517/0058; B65D2517/008; B65D2517/0082; B65D2517/50; B65D2517/5002; B65D2517/5024; B65D2517/5027; B65D2517/5029; B65D2517/5072; B65D2517/5075; B65D2517/5081; Y; Y10; Y10T; Y10T156/00; Y10T156/11; Y10T156/1168; Y10T156/1195; Y10T428/00; Y10T428/21; Y10T428/214; Y10T428/215; Y10T428/24; Y10T428/24025; Y10T428/24273; Y10T428/24298; Y10T428/24314; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 0
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |