US3560137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wholly aromatic polyamides of increased hydrolytic durability and solvent resistance
Assignee: EIDP Inc
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Filing: 1967-08-15
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Granted: 1971-02-02
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Expires: 1987-08-15
Abstract
Abstract HEATING CRIMPED SYNTHETIC, LINEAR, WHOLLY AROMATIC POLYAMIDE AND POLYIMIDE FIBERS TO A TEMPERATURE IN THE RANGE OF 275*C. TO 400*C. FOR 1 TO 10 MINUTES INCREASES THEIR HYDROLYTIC DURABILITY AND SOLVENT RESISTANCE.
Inventors
- 👤 Walter Leopold Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605; D06; D06M; D06M23/00
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 |