US3558571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing aromatic polyamides by solid phase thermal polymerization of urea and urethane derivatives of aromatic amino acids
Assignee: EIDP Inc
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Filing: 1969-05-15
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Granted: 1971-01-26
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Expires: 1989-05-15
Abstract
Abstract HIGH MOLECULAR WEIGHT ALL-AROMATIC POLYAMIDES ARE PREPARED IN A SOLID PHASE THERMAL POLYMERIZATION OF URETHANE AND UREA DERIVATIVES OF AROMATIC AMINO ACIDS. THE RESULTANT POLYMER IS USEFUL IN THE FORMATION OF SHAPED ARTICLES (E.G., FIBERS).
Inventors
- 👤 Roe C Blume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:30
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/12
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 |