Patent US3793281A successfully refreshed from Google Patents.
US3793281A
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Thermoplastic copolyimides
Assignee: I M L Corp A CORP OF DE
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Filing: 1972-07-14
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Granted: 1974-02-19
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Expires: 1992-07-14
Abstract
Abstract AROMATIC THERMOPLASTIC COPOLYIMIDES MADE FROM A 3,3'',4,4''-BENZOPHENONETETRACARBOXYLIC ACID DERIVATIVE AND TWO OR MORE AROMATIC DIAMINES, AT LEAST ONE OF WHICH IS META-SUBSTITUTED AND BOTH OR ALL OF WHICH ARE EITHER META- OR PARA-SUBSTITUTED, TOGETHER WITH PRECURSORS FOR AND METHODS OF PREPARING AND USING SUCH COPOLYIMIDES AND PRECURSORS.
Inventors
- 👤 L Acle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:07
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1042; Y; Y10; Y10S; Y10S521/00; Y10S521/918
Claims Analysis
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |