US3697216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of water-insoluble azo dyestuffs on textile material of cellulose or protein fibers
Assignee: Hoechst AG
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Filing: 1971-02-10
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Granted: 1972-10-10
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Expires: 1991-02-10
Abstract
Abstract PROCESS FOR THE PRODUCTION OF WATER-INSOLUBLE AZO DYESTUFFS ON TEXTILE MATERIAL OF CELLULOSE OR PROTEIN FIBERS BY IMPREGNATION WITH A SUBSTANTIVE AZO COMPONENT AND DEVELOPING WITH A DIAZONIUM COMPOUND OF AN AROMATIC AMINE, WHEREIN THE DEVELOPING STAGE IS CARRIED OUT BY ADDING THE DIAZONIUM COMPOUND AS WELL AS ALKALI BINDING AGENTS TO THE IMPREGNATION BATH IN THE PRESENCE OF A WETTING OR DISPERSING AGENT.
Inventors
- 👤 Hasso Hertel
- 👤 Kurt Gehre
- 👤 Rudolf Lowenfeld
- 👤 Uwe Kosubek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:27
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/68; D06P3/02; D06P3/04; D06P3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |