US3759731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuffs pigment mixture of polar and nonpolarsymmetrical asymmetrical disazo
Assignee: Hoechst AG
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Filing: 1971-03-12
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Granted: 1973-09-18
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Expires: 1991-03-12
Abstract
Abstract MIXTURES OF DISAZO DYESTUFFS OBTAINED BY COUPLING DIAZOTIZED 3,3''-DICHLORO-4,4''DIAMINO-DIPHENYL WITH A MIXTURE CONSISTING OF ONE OR TWO POLAR COUPLING COMPONENTS OF THE ACETOACETYLAMINO-BENZENE AND 1 - ARYL-PYRAZONEL - (5) SERIES CONTAINING CARBOXY AND/OR SULFONIC ACID GROUPS AND ANOTHER MIXTURE CONSISTING OF ONE OR TWO NON POLAR COUPLING COMPENENTS OF THE ACETOACETYLAMINO-BENZENE AND 1-ARYL-PYRAZOLONE-(5) SERIES WITHOUT ANY WATER-SOLUBILIZING GROUPS. THESE DYESTUFF MIXTURES SHOW IMPROVED RHEOLOGICAL PROPERTIES AND AN IMPROVED TINCTORIAL STRENGTH. MOREOVER, THEY YIELD PURER SHADES AND HAVE AN INCREASED TRANSPARANCY.
Inventors
- 👤 R Kuehne
- 👤 H Hamal
- 👤 J Ribka
- 👤 G Geissler
- 👤 W Herbst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:46
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0033; C09B67/0046; C09B67/0055; C09B35/00; C09B35/02; C09B35/039; C09B35/08; C09B35/10; C09B35/105; C09B35/18; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |