Patent US3663531A successfully refreshed from Google Patents.
US3663531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-insoluble phenyl-azo-phenyl dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1969-08-12
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Granted: 1972-05-16
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Expires: 1989-08-12
Abstract
Abstract NITROAZO DYESTUFFS OF THE FORMULA 2-((X,Y-PHENYL)-NH-(2-NO2-1,4-PHENYLENE)-N=N-), 4-R,Z-PHENOL IN WHICH X AND Y ARE EACH HYDROGEN, CHLORO, LOWER ALKYL, LOWER HYDROXYALKYL, LOWER ALKOXY, LOWER HYDROXYALKOXY PHENOXY, PHENYL-LOWER ALKOXY, LOWER ALKYLMERCAPTO, PHENYLMERCAPTO, OR LOWER ALKANOYLAMINO, R IS CHLORO, BROMO, LOWER ALKYL, CYCLOHEXYL, PHENYL, B-CYANOETHYL OR LOWER ALKOXY AND Z IS HYDROGEN OR LOWER ALKYL. THE NEW DYESTUFFS ARE USEFUL FOR DYEING CELLULOSE ACETATE, CELLULOSE TRIACETATE, POLYAMIDE AND ESPECIALLY POLYESTER FIBERS, ON WHICH THEY YIELD YELLOW TO ORANGE SHADES OF EXCELLENT FASTNESS PROPERTIES.
Inventors
- 👤 Hans Wilhelm Liechti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:47
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/40; C09B43/11; C09B56/00; C09B56/005; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/922
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |