US3637573A
Expired / Lapsed
US
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Polyurethanes stabilized with p-phenylenediamines
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1967-11-27
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Granted: 1972-01-25
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Expires: 1987-11-27
Abstract
Abstract A STABILIZED POLYURETHANE COMPOSITION CONTAINING PPHENYLENEDIAMINE OF THE FOLLOWING FORMULA: 1-(X-NH-),4-(Y-NH-)BENZENE WHEREIN EACH OF X AND Y STANDS FOR A SUBSTITUTED OR UNSUBSTITUTED HYDROCARBON GROUP.
Inventors
- 👤 Noritoshi Mise
- 👤 Minoru Yamada
- 👤 Kenichi Nishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/089; C08G18/28; C08G18/40; C08G18/48; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/18
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |