Patent US3591561A successfully refreshed from Google Patents.
US3591561A
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Process of production of polyurethane elastomer from a mixture of a lactone polyester polyol and a low molecular weight aliphatic diol
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1967-08-29
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Granted: 1971-07-06
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Expires: 1987-08-29
Abstract
Abstract POLYURETHANE ELASTOMER HAVING GOOD PHYSICAL PROPERTIES IS PRODUCED BY REACTING ORGANIC DIISOCYANATE WITH POLYOL MIXTURE CONSISTING OF LACTONE POLYESTER POLYOL AND LOW MOLECULAR ALIPHATIC DIOL, FOLLOWED BY CURING THE RESULTANT PRODUCT.
Inventors
- 👤 Seiji Kazama
- 👤 Fumihiro Doura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; 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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |