Patent US4124579A successfully refreshed from Google Patents.
US4124579A
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Arylazo-hydroxy pyridone dyes containing a pyridinium group
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-11-29
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Granted: 1978-11-07
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Expires: 1996-11-29
Abstract
Abstract Azo dyestuffs devoid of carboxylic acid and sulphonic acid groups and of the formula (I) <IMAGE> (I) wherein R is a hydrogen atom, halogen atom, cyano, nitro, hydroxy or amino group or an organic radical, R1 is a hydrogen atom, an optionally substituted hydrocarbon or heterocyclic radical or an amino group which may be substituted, Y is a group -OCOR2, -OSO2R2 or -NHSO2R2 wherein R2 is optionally substituted alkyl or aryl, K(+) is a cationic group, X(-) is an anion and the ring A may carry further substituents or have a benz ring fused thereon. Manufacture of such dyestuffs and use in the dyeing of synthetic polymeric materials.
Inventors
- 👤 Brian Parton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:27
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/02; D06P1/04; D06P1/08; C; C09; C09B; C09B29/00; C09B29/0003; C09B44/00; C09B44/02; C09B44/08; D06P5/00; D06P5/003; D06P5/004; D06P5/006
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
61 words
An azo dyestuff devoid of carboxylic acid and sulphonic acid groups and of the formula ##STR25## wherein R is methyl, R 1 is hydrogen or lower alkyl, Y is a group --OCOR 2 wherein R 2 is aryl or alkyl or more than 5 carbon atoms, K.sup.⊕ is a pyridinium or methyl ring substituted pyridinium group and X.sup.⊖ is an anion.
Claim 2
Dependent Claim
61 words
An azo dyestuff devoid of carboxylic acid and sulphonic acid groups and of the formula ##STR25## wherein R is methyl, R 1 is hydrogen or lower alkyl, Y is a group --OCOR 2 wherein R 2 is aryl or alkyl or more than 5 carbon atoms, K.sup.⊕ is a pyridinium or methyl ring substituted pyridinium group and X.sup.⊖ is an anion.
Claim 3
Dependent Claim
22 words
An azo dyestuff as claimed in claim 1 wherein the group Y is in the para position relative to the azo group.
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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |