US3619104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of level end-uniform dyeings with water-soluble sulfuric acid esters of leuco-vat dyestuffs
Assignee: Sandoz AG
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Filing: 1969-06-27
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Granted: 1971-11-09
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Expires: 1989-06-27
Abstract
Abstract A process for the production of consistently level and enduniform dyeings on textile materials selected from the group consisting of cotton and of mixtures of cotton and polyesters by padding with sulfuric acid esters of leuco-vat dyestuffs, wherein the padding is carried out in the presence of a polyglycol of the formula HO-(CHRCH2O)x-H in which R is a member selected from the group consisting of hydrogen and methyl and x is an integer, and which has an average molecular weight within the range of 1,000 to 20,000.
Inventors
- 👤 Joseph Van Diest
- 👤 Louis Frossard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:28
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/28; D06P1/44; D06P1/60; D06P1/613; D06P1/6138
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
A process as defined in claim 1, wherein the polyglycol has an avErage molecular weight within the range of 1,000 to 10,000.
Claim 2
Dependent Claim
26 words
A process as defined in claim 1, wherein R is hydrogen and the polyglycol has an average molecular weight within the range of 1,000 to 10,000.
Claim 3
Dependent Claim
44 words
A process as claimed in claim 1, wherein R is hydrogen and the polyglycol has an average molecular weight within the range of 1,000 to 10,000 and wherein the polyglycol is present in concentration within the range of 0.5 to 10 grams per liter.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |