US4087420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs containing an α-phenylamino isobutyric acid alkyl ester coupling component
Assignee: Cassella Farbwerke Mainkur AG
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Filing: 1975-11-07
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Granted: 1978-05-02
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Expires: 1995-11-07
Abstract
Abstract A water-insoluble azo dyestuff of the formula ##STR1## wherein D is an optionally substituted aromatic or heteroaromatic radical free of ionic groups; X is hydrogen or optionally substituted alkoxy; Y is hydrogen, optionally substituted alkyl, alkenyl, cycloalkyl, phenyl, hetaryl, alkoxy or phenoxy or --NHR 4 wherein R 4 is alkyl, alkenyl, cycloalkyl, aralkyl or aryl; R 1 and R 2 are hydrogen or alkyl and R 3 is optionally substituted alkyl and its utility in the dyeing and printing of hydrophobic synthetic fibers and films such as polyesters.
Inventors
- 👤 Ernst Heinrich
- 👤 Jachim Ribka
- 👤 Joachim Valentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:04
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/04; C09B29/00; C09B29/06; C09B29/08; C09B29/0805; C09B29/0807; C09B29/0809; C09B29/0811; C09B29/0815; C09B29/0816
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
8 words
The water-insoluble azo dyestuff of the formula ##STR37##
Claim 2
Dependent Claim
8 words
The water-insoluble azo dyestuff of the formula ##STR37##
Claim 3
Dependent Claim
8 words
The water-insoluble azo dyestuff of the formula ##STR38##
Claim 4
Dependent Claim
8 words
The water-insoluble azo dyestuff of the formula ##STR38##
References Cited (Backward Citations)
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US3359256A
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US3544550A
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Cited
DE2254017A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |