US3715340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyamides
Assignee: Foster Grant Co Inc
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Filing: 1971-08-19
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Granted: 1973-02-06
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Expires: 1991-08-19
Abstract
Abstract A METHOD OF PREVENTING THE FORMATION OF GEL IN POLYAMIDES PREPARED FROM AMINOCARBOXYLIC ACIDS OF LACTAMS COMPRISING ADDING TO THE CORRESPONDING MONOMER PRIOR TO ITS POLYMERIZATION ABOUT 0.025 TO 0.5 MOLE, PER 100 MOLES OF MONOMER, OF AN ALKYL AMMONIUM AROMATIC ACID SALT OR AN ALKYLENE BIS AMMONIUM AROMATIC ACID SALT.
Inventors
- 👤 A Finestone
- 👤 W Sims
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; C08G69/08; C08G69/14; C08G69/16
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |