US3682861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomers and a process for the production thereof
Assignee: Bayer AG
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Filing: 1970-01-16
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Granted: 1972-08-08
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Expires: 1990-01-16
Abstract
Abstract HIGH MOLECULAR WEIGHT POLYURETHANE ELASTOMERS HAVING HIGH RESISTANCE TO HYDROLYSIS AND WITHSTANDING HIGHER THERMAL STRESSES, OBTAINED BY REACTING A DIHYDROXYL COMPOUND WITH AN EXCESS OF A DIISOCYANATE, DISSOLVING THE ADDUCT THUS OBTAINED, REACTING THIS ADDUCT IN SOLUTION WITH AN EXCESS OF A DIAMINE, AND FINALLY REACTING THE POLYURETHANE POLYUREA WITH A SUBSTANTIALLY EQUIVALENT AMOUNT OF A DICARBOXYLIC ACID DIHALIDE. THE ELASTOMERS CAN BE SPUN TO THREADS AND FIBERS.
Inventors
- 👤 Eduard Radlmann
- 👤 Armin Kohler
- 👤 Klaus Konig
- 👤 Gunther Nischk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/831; 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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |