US3553172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastic polyurethane polymers from iso-cyanate terminated prepolymers and aromatic polyesters
Assignee: Bayer AG
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Filing: 1969-02-18
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Granted: 1971-01-05
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Expires: 1989-02-18
Abstract
Abstract ELASTIC FILAMENTS AND FOILS ARE PREPARED BY REACTING AN NCO-TERMINATED PREPOLYMER PREPARED FROM AN ALIPHATIC DIHYDROXY COMPOUND HAVING A MELTING POINT LESS THAN 60*C. AND AN AROMATIC DIISOCYANATE WITH AN AROMATIC POLYESTER HAVING A MELTING POINT GREATER THAN 180*C.
Inventors
- 👤 Wilhelm Thoma
- 👤 Heinrich Rinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; 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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |