Patent US3729459A successfully refreshed from Google Patents.
US3729459A
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Basic monoazo dyestuffs
Assignee: Novartis AG
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Filing: 1969-12-05
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Granted: 1973-04-24
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Expires: 1989-12-05
Abstract
Abstract Basic monoazo dyestuff of the formula where R is alkyl, R1 is phenyl or substituted phenyl, R2 and R3 are various organic substituents and X is an anion, which dyestuffs are useful in dyeing polyvinyl chloride, polyamide, polyurethane, polyester and especially polyacrylonitrile fibers with intense, level dyeings having good fastness to light and other good general fastness properties, having good stability within a wide pH range, having good affinity in aqueous solutions at different pH values and usually reserving wool wall.
Inventors
- 👤 G Hegar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:51
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/02; C09B44/04; C09B44/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
Azo dyes as claimed in claim 1, in which Y in the given formula represents a member selected from the group consisting of ethyl, Beta -lower alkoxy ethyl, Beta -cyanoethyl and acetoxyethyl, V is hydrogen, lower alkyl or carboxylic acylamino of up to four carbon atoms and W is hydrogen or lower alkoxy.
Claim 2
Dependent Claim
14 words
The basic azo dyestuff as claimed in claim 1 and corresponding to the formula
Claim 3
Dependent Claim
14 words
The basic azo dyestuff as claimed in claim 1 and corresponding to the formula
Claim 4
Dependent Claim
14 words
The basic azo dyestuff as claimed in claim 1 and corresponding to the formula
References Cited (Backward Citations)
US3079377A
Cited
US3252964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |