Patent US3761445A successfully refreshed from Google Patents.
US3761445A
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Process for the preparation of molding powders of heat stable anhydride polycondensates
Assignee: Rhone Poulenc SA
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Filing: 1971-01-22
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Granted: 1973-09-25
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Expires: 1991-01-22
Abstract
Abstract MOULDING POWDERS OBTAINED BY HEATING AN AZOPHTHALIC ANHYDRIDE/MONO- OR POLY-HYDROXYAROMATIC COMPOUND PRE-POLYCONDENSATE WITH A DIPRIMARY AROMATIC DIAMINE IN AN ORTHOPHOSPHATE OF THE FORMULA: O=P(-O-AR1)(-O-AR2)-O-R2 IN WHICH THE SYMBOLS AR1 AND AR2 WHICH MAY BE IDENTICAL OR DIFFERENT, REPRESENT A PHENYL, TOLYL OR XYLYL RADICAL AND THE SYMBOL R2 REPRESENTS AN ALKYL OR CHLOROALKYL RADICAL HAVING 1 TO 8 CARBON ATOMS OR ONE OF THE RADICALS REPRESENTED BY AR1 AND AR2 AS DILUENT.
Inventors
- 👤 M Balme
- 👤 M Ducloux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:27
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1032; C08G73/1085; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |