US3654237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aliphatic acid sulfonate modified polyamides
Assignee: Hoechst AG
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Filing: 1969-07-07
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Granted: 1972-04-04
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Expires: 1989-07-07
Abstract
Abstract USUAL POLYAMIDE-FORMING STARTING SUBSTANCES ARE CONDENSED IN THE PRESENCE OF ALIPHATIC SULFONATES OR SULFONATE ESTERS TO OBTAIN POLYAMIDES HAVING A PARTICULARLY GOOD DYE AFFINITY.
Inventors
- 👤 Christian Kosel
- 👤 Adolf Hartmann
- 👤 Gerhard Gatys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:55
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/42; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |