Patent US3637653A successfully refreshed from Google Patents.
US3637653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenyl-azo-phenyl dyestuffs
Assignee: Cassella Farbwerke Mainkur AG
•
Filing: 1968-10-08
•
Granted: 1972-01-25
•
Expires: 1988-10-08
Abstract
Abstract DYESTUFFS OF THE FORMULA: 1-(Y-NH-CO-NH-),2-(R-N=N-),4-X,5-(R1-N(-R2)-)BENZENE WHEREIN R IS THE RESIDUE OF A DIAZO COMPONENT OF A BENZENE OR HETEROCYCLIC SERIES FREE OF WATER SOLUBILIZING SUBSTITUENT GROUPS R1 AND R2 ARE ALIPHATIC SUBSTITUENTS, Y IS AN ALIPHATIC OR AROMATIC SUBSTITUENT AND X IS HYDROGEN OR ALIPHATIC AND THE UTILITY THEREOF PARTICULARLY IN DYEING AND PRINTING OF SYNTHETIC TEXTILE MATERIALS.
Inventors
- 👤 Hanswilli Von Brachel
- 👤 Dieter Cornelius
- 👤 Eberhard Stier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:03
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/78; C09B62/82; C09B62/825; C09B43/00; C09B43/40; C09B43/42
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |