US3554966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous polyamides
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-01-07
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Granted: 1971-01-12
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Expires: 1990-01-07
Abstract
Abstract AMORPHOUS OR AT MOST ONLY WEAKLY CRYSTALLINE, MELTFABRICATABLE AROMATIC POLYAMIDES PREPARED BY POLYCONDENSATION OF SPECIFIC AROMATIC DIAMINES IN WHICH THE AMINO GROUPS ARE ON NONADJACENT CARBON ATOMS AND AROMATIC DICARBOXYLIC ACIDS. REPRESENTATIVE DIAMINES ARE 4,4''-DIAMINODIPHENYL ETHER, M-PHENYLENE DIAMINE AND 4,4''-DIAMINODIPHENYL SULPHOXIDE WHILE EXAMPLES OF THE ACIDS INCLUDE THE MONO- AND POLY- ALKOXY DERIVATIVES OF ISOPHATHALIC AND TEREPHTHALIC ACIDS, DICARBOXYDIPHENYL ETHERS, BIS(CARBOXYPHENOXY) ALKANES AND BIS(CARBOXYPHENOXY)BENZENES.
Inventors
- 👤 Michael Edward Benet Jones
- 👤 Isaac Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:03
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725
Claims Analysis
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References Cited (Backward Citations)
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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 |