US3793291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyimides comprising carbinol groups,their manufacture and uses
Assignee: PETROLE CARBURANTS LUBRIFIANTS
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Filing: 1972-08-16
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Granted: 1974-02-19
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Expires: 1992-08-16
Abstract
Abstract SOLUBLE, HIGH MOLECULAR WEIGHT, CARBINOL-CONTAINING POLYIMIDES PROVIDED BY REACTING META- (OR PARA-) PHENYLENE-BIS-(4-HYDROXYMETHYLENE-PHTHALIC ACID), A DIESTER OR A TETRAESTER THEREOF WITH A PRIMARY DIAMINE AT 100400*C.
Inventors
- 👤 B Sillion
- 👤 C Cohen
- 👤 P Giuliani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:02
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/01; C07C65/105; C07C65/32; C07C65/34; C07C65/36; C08; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J2379/00; C08J2379/04; C08J2379/08
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) | 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 |