US2964797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrapping foils of high molecular thermoplastic polycarbonates
Assignee: Bayer AG
•
Filing: 1957-05-14
•
Granted: 1960-12-20
•
Expires: 1977-05-14
Abstract
No abstract record available.
Inventors
- 👤 Peilstocker Gunter
- 👤 Hechelhammer Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:27
CPC Classifications
C; C08; C08L; C08L69/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS FOR MANUFACTURING EASILY WELDED, TRANSPARENT FOILS THAT ARE HIGHLY IMPERMEABLE TO WATER VAPOR, WHICH PROCESS IS CHARACTERIZED BY THE STEPS OF MELTING A HIGH MOLECULAR WEIGHT THERMOPLASTIC FILM AND FIBER FORMPOLY-(DI-MONOHYDROXYARYLENE ALKANE CARBONATE) HAVING A WATER CONTENT NOT HIGHER THAN 0.05%, AND EXTRUDING THE MELT THROUGH A FOIL-FORMING NOZZLE UNDER A PRESSURE OF AT LEAST 50 ATMOSPHERES.
Claim 2
Dependent Claim
59 words
A PROCESS FOR MANUFACTURING EASILY WELDED, TRANSPARENT FOILS THAT ARE HIGHLY IMPERMEABLE TO WATER VAPOR, WHICH PROCESS IS CHARACTERIZED BY THE STEPS OF MELTING A HIGH MOLECULAR WEIGHT THERMOPLASTIC FILM AND FIBER FORMPOLY-(DI-MONOHYDROXYARYLENE ALKANE CARBONATE) HAVING A WATER CONTENT NOT HIGHER THAN 0.05%, AND EXTRUDING THE MELT THROUGH A FOIL-FORMING NOZZLE UNDER A PRESSURE OF AT LEAST 50 ATMOSPHERES.
References Cited (Backward Citations)
US2590186A
Cited
US2799667A
Cited
US2718666A
Cited
BE532543A
Cited
US2789970A
Cited
US2789966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |