Patent US3637583A successfully refreshed from Google Patents.
US3637583A
Expired / Lapsed
US
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Polyesterurethanes stabilized with iminocarbonates
Assignee: Bayer Corp
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Filing: 1968-10-23
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Granted: 1972-01-25
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Expires: 1988-10-23
Abstract
Abstract POLYESTER COMPOSITIONS STABILIZED AGAINST HYDROLYSIS AND AGEING ARE PREPARED BY INCORPORATING THEREIN IMINOCARBONATE COMPOUNDS.
Inventors
- 👤 Sidney H Metzger Jr
- 👤 John E Over
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:22
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/29
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 |