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Patent US3597392A successfully refreshed from Google Patents.
US3597392A
Expired / Lapsed
US
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Functionally substituted highly ordered azo-aromatic polyimides
Assignee: Monsanto Co
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Filing: 1969-01-21
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Granted: 1971-08-03
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Expires: 1989-01-21
Abstract
Abstract A CLASS OF ORDERED FIBER AND FILM-FORMING AROMATIC POLYAMIDE ACIDS AND CORRESPONDING POLYIMIDES DERIVED FROM CERTAIN SYMMETRICAL AROMATIC AZO DIAMINES BEARING ACID, HYDROXYL OR MERCAPTO SUBSTITUENTS OR DERIVATIVES HYDROLYZABLE TO SUCH SUBSTITUENTS HAVE BEEN FOUND TO POSSESS EXCELLENT THERMAL, AND MECHANICAL PROPERTIES USEFUL IN FIBERS, FILMS AND OTHER SHAPED ARTICLES.
Inventors
- 👤 Hartwig Bach
- 👤 Helmuth E Hinderer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:21
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; C08G73/1067; C08G73/1071; C08G73/1096
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |