US3679638A
Expired / Lapsed
US
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Preparing finely divided copolyamides by precipitation from alcohol-water solution
Assignee: Coathylene SA
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Filing: 1970-04-08
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Granted: 1972-07-25
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Expires: 1990-04-08
Abstract
Abstract VERY FINELY DIVIDED POWDERED COPOLYAMIDES, PARTICULARLY TERNAR COPOLYAMIDES MELTING BETWEEN 100*-200* C., ARE PREPARED BY FIRST DISSOLVING THE COPOLYAMIDE IN A MIXTURE OF C1-C5 ALCOHOL AND WATER CONTAINING A DISSOLVED IONIZABLE SALT AS A PRECIPITIATION AID, AND THEREAFTER REMOVING THE SOLVENT AS BY EVAPORATION.
Inventors
- 👤 Hans Helmuth Korsgen
- 👤 Wolfgang Weller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:07
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J2377/00
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |