US3817975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-insoluble disazo dyestuff derived from a dihydroxypyridine as coupling component
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-12-01
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Granted: 1974-06-18
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Expires: 1989-12-01
Abstract
Abstract Water-insoluble disazo dyestuff having the formula WHEREIN A is an optionally substituted aryl, thioazolyl, benzthiazolyl or anthraquinonyl, B is an optionally substituted phenylene, naphthylene or 4-pyrazolonyl-1-phenyl, Z is hydrogen or optionally substituted lower alkyl or phenyl, T1 and T2 each independently represent hydrogen, optionally substituted alkyl or aryl or hydroxy, cyano, carbonamido, acyl or carboalkoxy, and the use of said dyestuff for coloring paints, synthetic polymers and textile materials, in particular polyester textile materials, the coloration of which is fast to dry heat treatments.
Inventors
- 👤 A Berrie
- 👤 N Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:57
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/69; C07D213/78; C07D213/79; C07D213/80; C07D213/81; C07D213/82; C07D213/84; C07D213/85; C09; C09B; C09B31/00; C09B31/02; C09B31/12; C09B31/14; C09B31/153
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A water-insoluble disazo dyestuff of the formula
Claim 2
Dependent Claim
6 words
A disazo dye of the formula
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |