US3944382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of vat and sulfur dyes with vanadate activated bromate or iodate
Assignee: Olin Corp
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Filing: 1974-05-10
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Granted: 1976-03-16
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Expires: 1994-05-10
Abstract
Abstract An improved process for oxidizing vat or sulfur dyes is provided wherein the reduced form of the dye is oxidized by contact with an aqueous oxidizing solution comprising an alkali metal or ammonium vanadate and an oxidant comprising an alkali metal or ammonium bromate or iodate.
Inventors
- 👤 Richard L. Doerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:18
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67333; D06P1/6735; D06P1/67358; D06P1/22; D06P1/222; D06P3/00; D06P3/34; D06P3/52; D06P3/523; D06P3/70; D06P3/701
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
In a process for oxidizing vat or sulfur dyes present in reduced form on cotton or regenerated cellulose textile fibers by contacting said dye with an aqueous solution of an oxidizing agent comprising an alkali metal bromate or iodate, the improvement wherein said aqueous solution consists essentially of said oxidizing agent and .005 to 5% by weight alkali metal or ammonium vanadate, has a pH in the range of 3-6 and contacts said dye at a temperature of 75°-200°F.
Claim 2
Dependent Claim
79 words
In a process for oxidizing vat or sulfur dyes present in reduced form on cotton or regenerated cellulose textile fibers by contacting said dye with an aqueous solution of an oxidizing agent comprising an alkali metal bromate or iodate, the improvement wherein said aqueous solution consists essentially of said oxidizing agent and .005 to 5% by weight alkali metal or ammonium vanadate, has a pH in the range of 3-6 and contacts said dye at a temperature of 75°-200°F.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the weight ratio of said oxidant to said vanadate is 1:1 to 100:1.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said dye is a sulfur dye.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said vanadate is sodium, potassium, or ammonium vanadate.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said oxidant is sodium or potassium bromate.
Claim 7
Dependent Claim
13 words
The process of claim 4 wherein said oxidant is sodium or potassium iodate.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |