US3630987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear segmented polyurethane elastomers
Assignee: Bayer AG
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Filing: 1970-08-13
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Granted: 1971-12-28
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Expires: 1990-08-13
Abstract
Abstract LINEAR, SEGMENTED POLYURETHANE ELASTOMERS AND FILAMENTS THEREFROM, PRODUCED BY REACTIONS OF NCO PREPOLYMERS WITH EQUIVALENT AMOUNTS OF COMPOUNDS OF THE FORMULA H2N-NH-CO-NH-A-CO-NH-NH2 WHEREIN A IS M- OR P-PHENYLENE OR -CH2-1,4-PHENYLENE AS CHAIN LENGTHENING AGENTS IN POLAR ORGANIC SOLVENTS.
Inventors
- 👤 Wilhelm Thoma
- 👤 Harald Oertel
- 👤 Heinrich Rinke
- 👤 Ulrich Bahr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |