US4006130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triaszo dyestuffs containing etherified or esterified hydroxyl groups
Assignee: Bayer AG
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Filing: 1974-12-06
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Granted: 1977-02-01
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Expires: 1994-12-06
Abstract
Abstract Polyazo dyestuffs which in the form of the free acid correspond to the formula ##STR1## wherein R represents an etherified or esterified hydroxyl group in the o- or p-position, D represents the radical of a diazo component which, in the case that the sulpho group in the naphthalene ring is in the 4-position, is free of metallizable groups in the o-position and A can contain further substituents, are useful for the dyeing of hydroxy or nitrogen containing natural or synthetic fiber materials, for example, cellulose fibers in all states of processing, especially cotton and regenerated cellulose, as well as leather and paper.
Inventors
- 👤 Reiner Ditzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:20
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/38; C09B35/44; C09B35/46; C09B35/50; C09B35/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
Polyazo dyestuff which in the form of the free acid corresponds to the formula ##STR8## wherein R 1 is C 1 -C 4 -alkyl; and R 2 is C 2 -C 5 -alkylcarbonyl or benzoyl wherein said benzoyl is unsubstituted or substituted in the benzene nucleus by methyl, methoxy, chlorine, nitro, or sulpho.
Claim 2
Dependent Claim
53 words
Polyazo dyestuff which in the form of the free acid corresponds to the formula ##STR8## wherein R 1 is C 1 -C 4 -alkyl; and R 2 is C 2 -C 5 -alkylcarbonyl or benzoyl wherein said benzoyl is unsubstituted or substituted in the benzene nucleus by methyl, methoxy, chlorine, nitro, or sulpho.
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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |