US3491060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimidocarbonic esters and their preparation
Assignee: Bayer AG
•
Filing: 1967-07-11
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Granted: 1970-01-20
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Expires: 1987-07-11
Abstract
No abstract record available.
Inventors
- 👤 Hans-Dieter Schminke
- 👤 Wilhelm Gobel
- 👤 Ernst Grigat
- 👤 Rolf Putter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34
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) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |