US3759892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nent azo dye with a bis-(2-hydroxy-3-carboxyphenyl) methane coupling compo
Assignee: Sandoz AG
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Filing: 1970-02-12
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Granted: 1973-09-18
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Expires: 1990-02-12
Abstract
Abstract AZO DYES AND THEIR METAL COMPLEX COMPOUNDS ARE FORMED BY COUPLING 1 OR 2 MOLES OF A DIAZO COMPONENT WITH A BIS-1-(2-HYDROXY-3-CARBOXYPHENYL METHANE. THEY ARE HIGHLY SUITABLE FOR DYEING LEATHER, FOR WHICH THEY HAVE VERY GOOD PENETRATIVE PROPERTIES AND YIELD LIGHT-FAST DYEINGS.
Inventors
- 👤 H Wicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:07
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3206; D06P3/3226; D06P3/3233; C; C09; C09B; C09B33/00; C09B33/02; C09B33/04; C09B33/044; C09B45/00; C09B45/38; D06P3/326
Claims Analysis
Total Claims: 0
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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 |