US3558565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides from oxadicarboxylic acids and diamines containing aromatic nucleus
Assignee: Asahi Kasei Corp
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Filing: 1969-10-07
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Granted: 1971-01-26
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Expires: 1989-10-07
Abstract
Abstract NOVEL POLYAMIDES MELTING BETWEEN 190* AND 220*C., HAVING AN INTRINSIC VICOSITY OF 0.5 OR MORE WHEN MEASURED IN M-CRESOL AT 25*C. AND BEING OF THE FORMULA: H-(NH-(CH2)N-(1,4-PHENYLENE)-(CH2)N-NH-CO-(CH2)3-O-(CH2)4- CO)X-OH WHEREIN N IS 1 OR 2 AND X IS THE DEGREE OF POLYMERIZATION.
Inventors
- 👤 Kazuo Saotome
- 👤 Hiroshi Komoto
- 👤 Kenichiro Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:16
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/40
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |