Patent US3758443A successfully refreshed from Google Patents.
US3758443A
Expired / Lapsed
US
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Icular polyol polycarbonate process for the production of polyurethane elastomers based on a part
Assignee: Bayer AG
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Filing: 1972-04-24
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Granted: 1973-09-11
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Expires: 1992-04-24
Abstract
Abstract A PROCESS IS PROVIDED FOR THE PRODUCTION OF POLYURETHANE ELASTOMERS BY REACTING HIGHER MOLECULAR WEIGHT HYDROXY COMPOUNDS WHICH HAVE A MOLECULAR WEIGHT OF 800 TO 2500, DIISOCYANATES AND LOW MOLECULAR WEIGHT COMPOUNDS WHICH HAVE A MOLECULAR WEIGHT OF UP TO 400 AND WHICH CONTAIN AT LEAST TWO HYDROGEN ATOMS REACTIVE WITH ISOCYANATES, CHARACTERIZED IN THAT THE HIGHER MOLECULAR WEIGHT HYDROXY COMPOUNDS ARE CONDENSATION PRODUCTS OF 1,6-HEXANE DIOL, ADIPIC ACID AND DIARYL CARBONATE.
Inventors
- 👤 C Muhlhausen
- 👤 U Dobereiner
- 👤 K Konig
- 👤 E Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/675; C08G18/08; C08G18/10; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/44; C08G2410/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |