US3775367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame resistant polycarbonates
Assignee: Bayer AG
•
Filing: 1971-11-03
•
Granted: 1973-11-27
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Expires: 1991-11-03
Abstract
Abstract HIGH MOLECULAR WEIGHT, THERMOPLASTIC POLYCARBONATES OF DIVALENT PHENOLS HAVING IMPROVED FLAME RESISTANCE ARE PROVIDED WHICH CONTAIN PERFLUOROALKANE SULPHONATES.
Inventors
- 👤 W Nouvertne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:12
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |