US3554971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous or weakly crystalline aromatic polyamides
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-01-21
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Granted: 1971-01-12
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Expires: 1989-01-21
Abstract
Abstract AMORPHOUS OR AT MOST WEAKLY CRYSTALLINE AROMATIC POLYAMIDES MADE BY POLYCONDENSATION OF AT LEAST ONE DIAMINODIPHENYL SULPHONE AND ONE OR MORE DIACIDS FROM A GROUPING WHICH INCLUDES, FOR EXAMPLE, ISOPHTHALIC ACID, CERTAIN NAPHTHALENE DICARBOXYLIC ACIDS, POLYHALOTEREPHTHALIC ACIDS AND HALOISOPHTHALIC ACIDS OTHER THAN 5HALOISOPHTHALIC ACIDS, ALKOXYTEREPHTHALIC ACIDS AND ALKOXYISOPHTHALIC ACIDS AND DICARBOXY-DIPHENYL ETHERS. THE POLYAMIDES ARE MELT-FABRICATABLE.
Inventors
- 👤 Michael Edward Benet Jones
- 👤 Isaac Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:23
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/307; C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G69/36
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |