US3632293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dyeing or printing acrylonitrile copolymer textile materials with vat dyestuffs
Assignee: Borax Europe Ltd
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Filing: 1968-10-17
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Granted: 1972-01-04
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Expires: 1988-10-17
Abstract
Abstract Textile materials comprising fibers of a copolymer of essentially acrylonitrile and vinylidene chloride are dyed or printed, with a dyebath or printing paste comprising a vat dyestuff reduced with thiourea dioxide, which is then oxidized in situ to regenerate the dyestuff.
Inventors
- 👤 Pavel Krug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:41
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; D06P3/701; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
The process of claim 1, wherein step (b) is conducted by heating to a temperature of 80* to 110* C.
Claim 2
Dependent Claim
16 words
The process of claim 1, wherein the oxidation step (c) is conducted with alkaline hydrogen peroxide.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein said dyebath or printing paste includes an emulsified trialkyl phosphate or dialkyl phthalate.
Claim 4
Dependent Claim
55 words
The process of claim 1, wherein said vat dyestuff is present in step (a) in an amount of from 1 to 10 percent and said thiourea dioxide is present in step (a) in an amount of from 1 to 15 percent, each amount being a concentration expressed in terms of said dyebath or printing paste.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |