Patent US3711447A successfully refreshed from Google Patents.
US3711447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-forming polyamides with an increased content of amino groups prepared by using a partly linear aliphatic,partly cycloaliphatic polyamine as a modifier
Assignee: Hoechst AG
•
Filing: 1970-08-19
•
Granted: 1973-01-16
•
Expires: 1990-08-19
Abstract
Abstract NOVEL FILM AND FIBER-FORMING MODIFIED POLYAMIDES WITH AN INCREASED CONTENT OF AMINO GROUPS ARE OBTAINED, IF IN THE PREPARATION OF POLYAMIDES FROM THE COMMON STARTING COMPOUNDS POLYAMINES ARE ADDED WHICH HAVE PARTLY LINEAR ALIPHATIC, AND PARTLY CYCLO-ALIPHATIC AND, OPTIONALLY, AROMATIC STRUCTURAL UNITS IN THE MOLECULE-OPTIONALLY, IN ADMIXTURE WITH POLYAMINES HAVING PARTLY AROMATIC, AND PARTLY CYCLO-ALIPHATIC STRUCTURAL UNITS IN THE MOLECULE, AND/OR CYCLO-ALIPHATIC POLYAMINES WHICH MAY ALSO HAVE 1 ALIPHATIC C-ATOM EACH BETWEEN THE CYCLOALIPHATIC RINGS AND THE AMINO GROUPS.
Inventors
- 👤 W Fester
- 👤 E Hanschke
- 👤 F Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:44
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |