Patent US3691209A successfully refreshed from Google Patents.
US3691209A
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Anthraquinone dyestuffs
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-05-15
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Granted: 1972-09-12
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Expires: 1989-05-15
Abstract
Abstract Anthraquinone dyestuff of the formula: WHEREIN X is hydroxy or amino; R is hydroxy, alkoxy, mercapto or alkylmercapto, Z is an optionally further substituted phenylene or naphthylene radical; and the rings A and B can contain substituents; and the use of the said dyestuffs for coloring textile materials.
Inventors
- 👤 Colin William Greenhalgh
- 👤 David Francis Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:46
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/02; C09B1/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
A water-insoluble anthraquinone dyestuff as claimed in claim 2 wherein T is hydrogen, anilino, chloroanilino, lower alkyl-anilino and lower alkoxy-anilino.
Claim 2
Dependent Claim
20 words
A water-insoluble anthraquinone dyestuff as claimed in claim 2 wherein R'' is hydroxy, Z'' is phenylene, and T is anilino.
Claim 3
Dependent Claim
13 words
A water-insoluble anthraquinone dyestuff as claimed in claim 3 which is 1-amino-2-(4''-hydroxybenzyl)- 4-anilinoanthraquinone.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |