US3883523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triazine derivatives of triphenodioxazines
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1973-02-21
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Granted: 1975-05-13
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Expires: 1993-02-21
Abstract
Abstract Dyestuffs of the 2,9-diamino-6,13-dichlorotriphendioxazine series having from 1 to 4 sulphonic acid groups on the nucleus, and which are substituted on one or both of the amino groups by a chloro-, bromo- or sulpho-s-triazine reactive group, which may take the form -Tr - D - Tr where each Tr is a s-triazine nucleus of which at least one carries a Cl, Br or SO3H substituent and D is the residue of a diamine; the dyestuffs are cellulose-reactive dyes which provides bright reddish-blue to bright bluish-violet shades according to the extent to which the 2,9-amino groups are substituted.
Inventors
- 👤 Brian Parton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:21
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/40; C07D251/42; C07D251/44; C07D251/48; C07D251/50; C09; C09B; C09B19/00; C09B19/02; C09B62/00; C09B62/02; C09B62/04; C09B62/043; C09B62/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
5 words
A DYESTUFF OF THE FORMULA:
Claim 2
Dependent Claim
5 words
A DYESTUFF OF THE FORMULA:
Claim 3
Dependent Claim
8 words
A dyestuff of claim 1 having the formula:
References Cited (Backward Citations)
US2763641A
Cited
US2954378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |