US3717533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing plastic flexible containers having peelable seals
Assignee: TOWER PRODUCTS Inc A CORP OF
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Filing: 1971-05-27
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Granted: 1973-02-20
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Expires: 1991-05-27
Abstract
Abstract IN A PROCESS FOR FORMING A COLD PEELABLE BOND BETWEEN PLASTIC FILMS, POLYISOBUTYLENE-MODIFIED POLYETHYLENE RESINS PROVIDE COLD PEELABLE SEALS AFTER BEING BLOW EXTRUDED AT TEMPERATURES HIGHER THAN NORMAL EXTRUSION TEMPERATURES IN THE PRESENCE OF OXYGEN. VARIOUS FORMS OF ASEPTIC PACKAGES ARE DISCLOSED IN WHICH A PEELABLE SEAL MAY BE BENEFICIALLY EMPLOYED. D R A W I N G
Inventors
- 👤 D Mayworm
- 👤 W Rohde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/001; B29C48/0018; B29C48/0019; B29C48/09; B29C48/10
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |