Patent US3574171A successfully refreshed from Google Patents.
US3574171A
Expired / Lapsed
US
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Process for producing improved bbb type polymer
Assignee: Celanese Corp
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Filing: 1969-10-20
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Granted: 1971-04-06
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Expires: 1989-10-20
Abstract
Abstract A PROCESS IS PROVIDED FOR PRODUCING AN IMPROVED BBB TYPE POLYMER, I.E. POLY(BISBENZIMISAZOBENZOPHENANTHROLINE) AND RELATED NITROGENOUS POLYMERS. THE IMPROVED BBB TYPE POLYMER IS ESSENTIALLY FREE OF UNSTABLE LINKAGES AND IS FORMED BY SLURRYING BULK POLYMER WHILE IN PARTICULATE FORM IN A DILUTE AQUEOUS SOLUTION OF AN ALKALINE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, LITHIUM HYDROXIDE, AMMONIA, AND MIXTURES OF THE FOREGOING. THE POLYMER FORMED IN THE PRESENT PROCESS IS PARTICULARLY SUITED FOR THE FORMATION OF THERMALLY STABLE SHAPED ARTICLES, E.G. FIBERS OR FILMS, EXHIBITING IMPROVED TENSILE PROPERTIES.
Inventors
- 👤 Edward C Chenevey
- 👤 Rufus S Jones Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:55
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/20; D; D01; D01F; D01F6/00; D01F6/58; D01F6/74
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |