Patent US3681402A successfully refreshed from Google Patents.
US3681402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuff manufacture
Assignee: Beazer East Inc
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Filing: 1969-05-06
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Granted: 1972-08-01
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Expires: 1989-05-06
Abstract
Abstract Anthraquinone dyes are prepared in substantially quantitative yields by reacting a diaminodihydroxyanthraquinone, such as 4,5diaminochrysazin, with a benzenesulfonyl chloride in a thin fluid melt consisting essentially of anhydrous aluminum halide in admixture with a compound that gives a fluid melt at low temperatures. New dyes having improved substantivity on polyester fibers are made by an alternate embodiment involving the concurrent addition of a halogen such as bromine to the anhydrous aluminum halide melt.
Inventors
- 👤 Guido R Genta
- 👤 Koppers Co Inc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:49
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/503
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
Method according to claim 1 in which the reaction temperature of the melt is 75*-125*C. and the melt is anhydrous aluminum chloride.
Claim 2
Independent Claim
10 words
A method of making an anthraquinone dye of the formula:
Claim 3
Dependent Claim
22 words
Method according to claim 3 in which the reaction temperature of the melt is 75*-125*C. and the melt is anhydrous aluminum chloride.
References Cited (Backward Citations)
GB1045411A
Cited
GB1053455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |