US3578652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Red phenylazo naphthol dyestuff
Assignee: Honeywell International Inc
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Filing: 1967-10-20
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Granted: 1971-05-11
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Expires: 1987-10-20
Abstract
Abstract MONOAZO DYESTUFFS ARE PREPARED BY COUPLING A 3-DIAZO6-ALKOXYBENZENE SULFONIC ACID AND AN A-NAPHTHOL DISULFONIC ACID AND PRECIPITATING THE DYE, EITHER AS THE FREE ACID OR AS AN AMMONIUM OR METAL SALT. THE TRISODIUM SALTS ARE PREFERRED BECAUSE OF THEIR LOW TOXICITY TO WARM-BLOODED ANIMALS. THE DYESTUFFS ARE USEFUL AS COLORANTS FOR FOODS, PHARMACEUTICALS, COSMETICS, AND THE LIKE, AND FORM ALUMINUM LAKES USEFUL AS PIGMENTS FOR PLASTICS.
Inventors
- 👤 Gustav E Rast
- 👤 Russell I Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:44
CPC Classifications
C; C09; C09B; C09B63/00; C09B63/005; A; A23; A23L; A23L5/00; A23L5/40; A23L5/42; A23L5/47
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |