Patent US3787179A successfully refreshed from Google Patents.
US3787179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of insoluble azo dyestuffs on cellulose fibers
Assignee: Hoechst AG
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Filing: 1971-12-10
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Granted: 1974-01-22
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Expires: 1991-12-10
Abstract
Abstract Process for the preferably continuous manufacture of waterinsoluble azo dyestuffs on textile materials made of cellulose fibers, which comprises carrying out, after the application of the coupling component and of the diazo component from an aqueous dye bath, the finishing operation of the dyeings in organic solvents. The diazo component is in the form of a diazo-amino compound capable of being split up or of an anti-diazotate of a primary aliphatic amine. The organic solvent a hydrocarbon which may be halogenated, aromatic or cycloaliphatic.
Inventors
- 👤 R Lowenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:33
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/68; D06P1/00; D06P1/90; D06P1/92; D06P1/922
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A process as claimed in claim 1, wherein the dyestuff pigments obtained show a limited solubility in the solvent used.
Claim 2
Dependent Claim
18 words
A process as claimed in claim 1, wherein the solvent used contains up to 6% of emulsified water.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |