Patent US3560440A successfully refreshed from Google Patents.
US3560440A
Expired / Lapsed
US
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High molecular weight linear aromatic copolyamides
Assignee: Bayer AG
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Filing: 1969-04-03
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Granted: 1971-02-02
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Expires: 1989-04-03
Abstract
Abstract HIGH MOLECULAR LINEAR AROMATIC COPOLYAMIDES BY COCONDENSATION OF AMINOPHENOXYBENZOIC ACID ESTERS OF THE GENERAL FORMULA ((NH2,R2-PHENYL)-O-),(R1-OOC-),R3-BENZENE WHEREIN: R1 REPRESENTS AN ALKYL OR ARYL RADICAL AND R2 AND R3 REPRESENT HYDROGEN, ALKYL OR ARYL RADICALS, TOGETHER WITH EQUIVALENT AMOUNTS OF AROMATIC DIAMINES AND AROMATIC DICARBOXYLIC ACIDS OR WITH AROMATIC AMINOCARBOXYLIC ACIDS.
Inventors
- 👤 Heinrich Gilch
- 👤 Ludwig Bottenbruch
- 👤 Hermann Schnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:08
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/12; C08G69/36
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |