US4247456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-insoluble monoazo pyridone dye
Assignee: Sanofi Aventis Deutschland GmbH
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Filing: 1976-11-19
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Granted: 1981-01-27
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Expires: 1996-11-19
Abstract
Abstract Water-insoluble monoazo dyes of the formula ##STR1## produced by reacting a diazotized amine of the benzene, naphthalene, diphenyl, diphenylmethane or heterocyclic series which is free from water solubilizing groups with the appropriate 6-hydroxy-2-pyridone and the utility thereof for the dyeing and printing of synthetic fabric materials to yellow to red shades having excellent fastness to light and sublimation.
Inventors
- 👤 Hanswilli von Brachel
- 👤 Ernst Heinrich
- 👤 Otto Grawinger
- 👤 Karl Hintermeier
- 👤 Horst Kindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:20
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617; C09B29/3621; C09B29/3626
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A monoazo dye of the formula ##STR200##
Claim 2
Dependent Claim
7 words
A monoazo dye of the formula ##STR200##
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |