Patent US3801545A successfully refreshed from Google Patents.
US3801545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soluble aromatic polyamides and filaments with a high modulus of elasticity produced from them
Assignee: Bayer AG
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Filing: 1972-09-01
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Granted: 1974-04-02
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Expires: 1992-09-01
Abstract
Abstract THE INVENTION RELATES TO HIGH MOLECULAR WEIGHT AROMATIC POLYAMIDES WITH A RELATIVE SOLUTION VISCOSITY NREL MEASURED INA 0.5% SOLUTION IN N-METHYKPRROLIDONE AT 25* C. OF BETWEEN 1.7 AND 3.2, CONSISTING OF RECURRENT STRUCTURAL UNITS OF THE GENERAL FORMULA -NH-(R1-PHENYLENE)-O-(R2-1,3-PHENYLENE)-X-(R3-1,4- PHENYLENE)-NH-CO-AR-CO- IN WHICH X,R1,R3 AND AR.HAVE THE MEANING AS DEFINED IN THE SPECIFICATION OF THE APPLICATION.
Inventors
- 👤 H Kunzel
- 👤 G Nischk
- 👤 G Blankenstein
- 👤 F Bentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:22
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |