US3993441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-Nitro,2-alkylbenzene azo-3-cyano-4-methyl-6-hydroxy-2-pyridone dyeing of synthetic hydrophobic fibers
Assignee: Cassella Farbwerke Mainkur AG
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Filing: 1975-05-01
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Granted: 1976-11-23
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Expires: 1995-05-01
Abstract
Abstract Dyestuffs, free of ionic groups, of the formula: ##SPC1## Wherein R is alkyl having 1 to 6 carbon atoms and the utility thereof in the dyeing and printing of synthetic materials deep yellow with excellent fastness properties.
Inventors
- 👤 Ernst Heinrich
- 👤 Joachim Ribka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:20
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617; C09B29/3621; C09B29/3626; C09B29/363; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921; Y10S8/922; Y10S8/933
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
In the process for dyeing and printing synthetic hydrophobic fibers with a monoazo dyestuff, the improvement wherein said monoazo dyestuff is of the formula ##SPC9## wherein R is alkyl having 1 to 6 carbon atoms.
Claim 2
Dependent Claim
35 words
In the process for dyeing and printing synthetic hydrophobic fibers with a monoazo dyestuff, the improvement wherein said monoazo dyestuff is of the formula ##SPC9## wherein R is alkyl having 1 to 6 carbon atoms.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein R is CH 3 .
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein R is C 2 H 5 .
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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |