US3898033A
Expired / Lapsed
US
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Novel disazo dyes and aqueous concentrated solutions thereof
Assignee: Honeywell International Inc
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Filing: 1973-06-13
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Granted: 1975-08-05
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Expires: 1993-06-13
Abstract
Abstract Dyestuffs of the formula WHEREIN X1 and X2 represent hydrogen, methyl or methoxy and the alkali metal salts thereof. Solutions of these dyes containing up to about 25 weight percent dissolved dye which are characterized by low viscosity and stability to gelation and dye precipitation are useful as homogeneous aqueous dye concentrates for dyeing paper and other cellulosic fibers in fast orange to red shades.
Inventors
- 👤 John H Mcleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:16
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/28; C; C09; C09B; C09B33/00; C09B33/02; C09B33/04; C09B33/056; C09B67/00; C09B67/0071; C09B67/0072; C09B67/0073; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/6008; Y; Y10; Y10S; Y10S534/00; Y10S534/01; Y10S8/00; Y10S8/916; Y10S8/918; Y10S8/919
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
A MIXTURE OF DYESTUFFS COMPRISING AT LEAST TWO DIFFERENT COMPOUNDS HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
14 words
A MIXTURE OF DYESTUFFS COMPRISING AT LEAST TWO DIFFERENT COMPOUNDS HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim
63 words
A mixture as claimed in claim 1 which is a mixture of from about 20 to 30 mole percent of the dyestuff wherein X1 and X2 are hydrogen, from about 20 to 30 mole percent of the dyestuff wherein X1 and X2 are methyl and from about 40 to 60 mole percent of the dyestuff wherein X1 is hydrogen and X2 is methyl.
Claim 4
Dependent Claim
61 words
A mixture of as claimed in claim 2 which contains from about 20 to 25 mole percent of the dyestuff wherein X1 and X2 are hydrogen from about 25 to 30 mole percent of the dyestuff wherein X1 and X2 are methyl and from about 45 to 55 mole percent of the dyestuff wherein X1 is hydrogen and X2 is methyl.
Claim 5
Dependent Claim
14 words
A mixture as claimed in claim 3 wherein the component dyestuffs are tetrasodium salts.
References Cited (Backward Citations)
US2746955A
Cited
US3701624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |