US3738964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyamides derived from a mixture of aromatic diamines containing 4,4-diamino-oxanilide
Assignee: Monsanto Co
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Filing: 1972-05-31
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Granted: 1973-06-12
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Expires: 1992-05-31
Abstract
Abstract A FILM- AND FIBER-FORMING AROMATIC POLYAMIDE COMPRISING REPEATING UNITS, WHEREIN EACH UNIT IS OF THE FORMULA -NH-(1,4-PHENYLENE)-(R-(1,4-PHENYLENE))N-NH-CO-AR-CO- IN WHICH R REPRESENTS A COVALENT BOND OR A DIVALENT RADICAL SELECTED FROM FIBERS PREPARED FROM THESE POLYAMIDES ARE THERMALLY STABLE, HAVE A HIGH MODULUS AND ARE PARTICULARLY USEFUL AS REINFORCING ELEMENTS FOR RUBBER AND PLASTIC ARTICLES. -NH-CO-CO-NH- IN WHICH R'' IS A C1 TO C4 ALKYL GROUP, AR REPRESENTS A PARA- OR META-PHENYLENE RADICAL AND N IS 0 OR 1, AND WHEREIN BETWEEN 10 AND 90 MOLE PERCENT OF SAID UNITS ARE OF SAID FORMULA WHERE R IS -NH-CO-CO-NH- -O-, -CH2-, -CO-, -S-, -SO2-, -C(-R'')2-, AND
Inventors
- 👤 F Dobinson
- 👤 F Silver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:11
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)
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |