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Patent US3711443A successfully refreshed from Google Patents.
US3711443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear segmented polyurethane elastomers
Assignee: Bayer AG
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Filing: 1971-04-07
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Granted: 1973-01-16
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Expires: 1991-04-07
Abstract
Abstract NH2-NH-CO-R-NH-CO-NH-R'' -NH-CO-NH-R-CO-NH-NH2 LINEAR SEGMENTED POLYURETHANE ELASTOMERS OBTAINED BY REACTION OF NCO-PREPOLYMERS WITH CHAIN EXTENDING AGENTS IN POLAR ORGANIC SOLVENTS, AT LEAST 55 MOL PERCENT OF SAID CHAIN EXTENDING AGENTS BEING A COMPOND OF THE FORMULA
Inventors
- 👤 W Thoma
- 👤 H Oertel
- 👤 H Rinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/906
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |