US4052380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trisazo dyes containing two different aminonaphtholsulphonic acid coupler components
Assignee: Aziende Colori Nazionali Affini ACNA SpA
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Filing: 1975-04-11
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Granted: 1977-10-04
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Expires: 1995-04-11
Abstract
Abstract New direct dyes which can be diazotized on fibers and have the general formula ##STR1## are disclosed. In the formula, A and B, which are different from each other, are amino-naphtholsulphonic acids. A process for making the new dyes by coupling one mole of a tetrazo derivative of 4,4-diamino-azobenzol with a mixture containing substantially one mole of the amino-naphtholsulphonic acid A and one mole of the different amino-naphtholsulphonic acid B, in an alkaline medium, is also enclosed.
Inventors
- 👤 Ermanno Gaetani
- 👤 Sandro Ponzini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/35
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A direct dye diazotizable on fibers and having the formula: ##STR5## wherein A and B, different from each other, are amino-naphtholsulphonic acids selected from the group consisting of 1-amino-8-naphthol-3,6-sulphonic acid; 1-amino-8-naphthol-4, 6-disulphonic acid; 2-amino-8-naphthol-6-sulphonic acid and 2-amino-5-naphthol-7-sulphonic acid.
Claim 2
Dependent Claim
38 words
A direct dye diazotizable on fibers and having the formula: ##STR5## wherein A and B, different from each other, are amino-naphtholsulphonic acids selected from the group consisting of 1-amino-8-naphthol-3,6-sulphonic acid; 1-amino-8-naphthol-4, 6-disulphonic acid; 2-amino-8-naphthol-6-sulphonic acid and 2-amino-5-naphthol-7-sulphonic acid.
Claim 3
Dependent Claim
12 words
A dye according to claim 1, characterized in having the formula: ##STR6##
Claim 4
Dependent Claim
12 words
A dye according to Claim 1, characterized in having the formula: ##STR7##
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |