Patent US4160643A successfully refreshed from Google Patents.
US4160643A
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Water soluble cationic azo dyestuffs containing a cyclammonium group
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-12-27
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Granted: 1979-07-10
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Expires: 1996-12-27
Abstract
Abstract A mixture of water soluble cationic azo dyestuffs devoid of carboxylic acid or sulphonic acid groups, each dyestuff in said mixture containing at least one cyclammonium group and said dyestuffs differing only in the constitution of the said cyclammonium group, said cyclammonium group being a gamma-picolinium group in one dyestuff and a beta-picolinium group in another dyestuff in said mixture, the water-solubility of said mixture being superior to that of the individual dyestuffs, the mixture being particularly useful for the coloration of polymers and copolymers of acrylonitrile.
Inventors
- 👤 Peter Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:32
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/001; C09B44/00; C09B44/10; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A mixture of water soluble cationic azo dyestuffs devoid of carboxylic acid or sulphonic acid groups, each dyestuff in said mixture containing at least one cyclammonium group and said dyestuffs differing only in the constitution of the said cyclammonium group, said cyclammonium group being a gamma-picolinium group in one dyestuff and a beta-picolinium group in another dyestuff in said mixture, the water-solubility of said mixture being superior to that of the individual dyestuffs.
Claim 2
Dependent Claim
73 words
A mixture of water soluble cationic azo dyestuffs devoid of carboxylic acid or sulphonic acid groups, each dyestuff in said mixture containing at least one cyclammonium group and said dyestuffs differing only in the constitution of the said cyclammonium group, said cyclammonium group being a gamma-picolinium group in one dyestuff and a beta-picolinium group in another dyestuff in said mixture, the water-solubility of said mixture being superior to that of the individual dyestuffs.
References Cited (Backward Citations)
US3948598A
Cited
US3958287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |