US3705145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo dyestuffs
Assignee: Bayer AG
•
Filing: 1970-11-19
•
Granted: 1972-12-05
•
Expires: 1990-11-19
Abstract
Abstract DISAZO DYESTUFFS OF FORMULA 6-(4-(4-(R-NH-NAPHTHVL)-N=N-)NAPHTHYL-N=N-)- 1,3-BENZODIOXAN IN WHICH R DENOTES ALKYL GROUPS, WHICH CAN BE SUBSTITUTED BY ALKOXY RADICALS, ALKOXYCARBONYL RADICALS, NITRILE, HYDROXYL OR HALOGEN, AS WELL AS THEIR PREPARATION AND THEIR USE FOR DYEING HYDROPHOBIC FIBRE MATERIALS.
Inventors
- 👤 Alois Gottschlich
- 👤 Klaus Leverenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:09
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/04; C09B31/053
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |