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Patent US4082503A successfully refreshed from Google Patents.
US4082503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of water-insoluble azo dyestuffs on the fiber
Assignee: Hoechst AG
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Filing: 1976-08-03
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Granted: 1978-04-04
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Expires: 1996-08-03
Abstract
Abstract It had been found that boric acid can advantageously be used as a buffer and neutralization agent in the developing bath containing the azonium compound in a process for the preparation of water-insoluble azo dyestuffs on the fiber according to the ice-color technique, thus avoiding ecological problems with regard to the waste water obtained in the dyeing process.
Inventors
- 👤 Hasso Hertel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:38
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A process for the preparation of a water-insoluble azo dyestuff on cellulose fiber according to the ice-color technique, which comprises using for the developing of the dyeing goods treated with the alkali metal salt of a coupling component in the neutral or slightly alkaline range, a developing bath with the diazonium compound which also contains boric acid.
Claim 2
Dependent Claim
57 words
A process for the preparation of a water-insoluble azo dyestuff on cellulose fiber according to the ice-color technique, which comprises using for the developing of the dyeing goods treated with the alkali metal salt of a coupling component in the neutral or slightly alkaline range, a developing bath with the diazonium compound which also contains boric acid.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |