US3553167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters
Assignee: Bayer AG
•
Filing: 1968-03-18
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Granted: 1971-01-05
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Expires: 1988-03-18
Abstract
Abstract A PROCESS FOR PREPARING POLYMERS BY REACTING A DICARBOXYLIC ACID, A DIOL OR AN HYDROXYCARBOXYLIC ACID AND A DIARYL CARBONATE IN A RATIO OF 1 MOL OF THE DICARBOXYLIC ACID, AT LEAST 1 MOL OF THE DIOL OR THE HYDROXYCARBOXYLIC ACID AT LEAST 2 MOLS OF THE DIARYL CARBONATE.
Inventors
- 👤 Hermann Schnell
- 👤 Volker Bollert
- 👤 Gerhard Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; C08G63/78; C08G63/82; C08G63/83
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |