US3979378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble azo dyes having a substituted 2-hydroxypyridone (6) coupling component
Assignee: BASF SE
•
Filing: 1971-01-27
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Granted: 1976-09-07
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Expires: 1991-01-27
Abstract
Abstract Azo dyes containing sulfonic or carboxylic acid groups and having a substituted 2-hydroxypyridone-(6) as coupling component. The dyes are particularly valuable for dyeing natural or synthetic polyamides.
Inventors
- 👤 Gerhard Gnad
- 👤 Gunther Lamm
- 👤 Johannes Dehnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:34
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/80; C07D213/81; C07D213/82; C07D213/84; C07D213/85; C09; C09B; C09B29/00; C09B29/0025; C09B29/0055; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617; C09B29/3621; C09B29/3626; C09B31/00; C09B31/02; C09B31/12; C09B31/14; C09B31/153; C09B35/00; C09B35/02; C09B35/021; C09B35/03; C09B35/031; C09B35/039; C09B35/08; C09B35/10; C09B35/18; C09B35/185
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
The compound of the formula ##SPC20##
Claim 2
Dependent Claim
6 words
The compound of the formula ##SPC20##
Claim 3
Dependent Claim
6 words
The compound of the formula ##SPC21##
Claim 4
Dependent Claim
6 words
The compound of the formula ##SPC21##
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |