Patent US3271367A successfully refreshed from Google Patents.
US3271367A
Expired / Lapsed
US
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Thermoplastic polycarbonates of dihydroxydiarylene sulfones and their preparation
Assignee: Bayer AG
•
Filing: 1956-03-21
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Granted: 1966-09-06
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Expires: 1976-03-21
Abstract
No abstract record available.
Inventors
- 👤 Schnell Hermann
- 👤 Krimm Heinrich
- 👤 Bottenbruch Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:57
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/081
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
A LINEAR HIGH MOLECULAR WEIGHT RESINUOUS POLYCARBONATE OF A COMPOUND OF THE FORMULA:
References Cited (Backward Citations)
US1756819A
Cited
US2035578A
Cited
US2210817A
Cited
US2455653A
Cited
US2762789A
Cited
BE532543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |