US3062781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polycarbonates
Assignee: Bayer AG
•
Filing: 1958-07-02
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Granted: 1962-11-06
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Expires: 1978-07-02
Abstract
No abstract record available.
Inventors
- 👤 Bottenbruch Ludwig
- 👤 Fritz Gerhard
- 👤 Schnell Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:05
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/22; C08G64/24; C08G64/04; C08G64/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
IN A PROCESS WHEREIN A NUCLEARLY HALOGENATED DI(MONOHYDROXYARYL) ALKALINE OF THE FORMULA:
Claim 2
Dependent Claim
12 words
IN A PROCESS WHEREIN A NUCLEARLY HALOGENATED DI(MONOHYDROXYARYL) ALKALINE OF THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |