US3736295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomers from aromatic diamines containing ether groups
Assignee: Bayer AG
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Filing: 1971-09-16
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Granted: 1973-05-29
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Expires: 1991-09-16
Abstract
Abstract NOVEL AROMATIC DIAMINES CONTAINING ETHER GROUPS AND HAVING CHLORINE ATOMS IN THE O-POSITION TO THE AMINO GROUPS ARE USEFUL TO PREPARE POLYURETHANE ELASTOMERS THEREFROM WITH AN ORGANIC DIISOCYANATE AND AN ORGANIC COMPOUND CONTAINING AT LEAST TWO HYDROXYL GROUPS AND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 800 TO ABOUT 5000.
Inventors
- 👤 W Meckel
- 👤 K Konig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:13
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3814; C08G18/08; C08G18/10
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |