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Patent US3250744A successfully refreshed from Google Patents.
US3250744A
Expired / Lapsed
US
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High molecular weight thermoplastic polycarbonates and process for the production thereof
Assignee: Bayer AG
•
Filing: 1957-10-08
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Granted: 1966-05-10
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Expires: 1977-10-08
Abstract
No abstract record available.
Inventors
- 👤 Schnell Hermann
- 👤 Krimm Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:32
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/16; C08G64/1608; C08G64/04; C08G64/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
HIGH MOLECULAR WEIGHT, LINEAR, FILM AND FIBER FORMING THERMOPLASTIC POLYCARBONATES CONSISTING SOLELY OF RECURRING ORGANOCARBONATO UNITS FROM ABOUT 20 TO 100 MOL PERCENT OF WHICH ARE
Claim 2
Dependent Claim
26 words
HIGH MOLECULAR WEIGHT, LINEAR, FILM AND FIBER FORMING THERMOPLASTIC POLYCARBONATES CONSISTING SOLELY OF RECURRING ORGANOCARBONATO UNITS FROM ABOUT 20 TO 100 MOL PERCENT OF WHICH ARE
References Cited (Backward Citations)
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US2789972A
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US2799666A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |