Patent US6274444B1 successfully refreshed from Google Patents.
US3598786A
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US
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Novel oligomers,novel thermally stable polymers and method of their manufacture
Assignee: Toray Industries Inc
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Filing: 1967-03-31
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Granted: 1971-08-10
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Expires: 1987-03-31
Abstract
Abstract THIS INVENTION CONCERNS NOVEL OLIGOMERS AND THERMALLY STABLE POLYMERS OF THE NOVEL STRUCTURE PRODUCED FROM SAID OLIGOMERS AND POLYAMINES, AND A METHOD OF THE MANUFACTURE OF THESE POLYMERS AND OLIGOMERS. THE SAID THERMALLY STABLE POLYMERS HAVE REMARKABLY IMPROVED STABILITY AGAINST HYDROLYSIS AND ABRASIVE RESISTANCE OVER THE CONVENTIONALLY KNOWN POLYIMIDE-TYPE THERMALLY STABLE POLYMERS, AND CONCURRENTLY POSSESS THE EXCELLENT PROPERTIES OF THE SAID KNOWN POLYMERS. THE OLIGOMER MAY BE EXPRESSED BY THE FOLLOWING FORMULA III: (-CO-O-CO-)>(R)2-CO-NH-(R1(-X)2)-NH-CO-(R2)<(-CO-O-CO-)
Inventors
- 👤 Naoya Yoda
- 👤 Masaru Kurihara
- 👤 Shunroku Tohyama
- 👤 Kojuro Ikeda
- 👤 Noriaki Dokoshi
- 👤 Ryoji Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:28
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/20
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |