US2528614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vat dyeing process for cellulose acetate textile material
Assignee: Celanese Corp
•
Filing: 1946-10-02
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Granted: 1950-11-07
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Expires: 1966-10-02
Abstract
No abstract record available.
Inventors
- 👤 George W Seymour
- 👤 George C Ward
- 👤 Robert L Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:01
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/228
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
PROCESS FOR THE COLORATION OF CELLULOSE ACETATE TEXTILE MATERIALS, WHICH COMPRISES MECHANICALLY IMPREGNATING A CELLULOSE ACETATE TEXTILE MATERIAL WITH AN AQUEOUS SUSPENSION OF AN INDIGOID VAT DYESTUFF, DRYING THE DYESTUFF IMPREGNATED TEXTILE MATERIAL, IMPREGNATING THE LATTER WITH AN AQUEOUS SOLUTION CONTAINING 2 TO 15% BY WEIGHT OF SODIUM SUFOXYLATE FORMALDEHYDE AND 5 TO 10% BY WEIGHT OF DI-ETHANOLAMINE, STEAMING THE WET TEXTILE MATERIAL UNTIL THE INDIGOID VAT DYESTUFF IS REDUCED TO THE LEUCO FORM, AND THEN OXIDIZING THE LEUCO INDIGOID VAT DYESTUFF TO THE FINAL COLORED FORM IN AN AQUEOUS SOLUTION OF SODIUM DICHROMATE ACIDIFIED WITH ACETIC ACID.
Claim 2
Dependent Claim
98 words
PROCESS FOR THE COLORATION OF CELLULOSE ACETATE TEXTILE MATERIALS, WHICH COMPRISES MECHANICALLY IMPREGNATING A CELLULOSE ACETATE TEXTILE MATERIAL WITH AN AQUEOUS SUSPENSION OF AN INDIGOID VAT DYESTUFF, DRYING THE DYESTUFF IMPREGNATED TEXTILE MATERIAL, IMPREGNATING THE LATTER WITH AN AQUEOUS SOLUTION CONTAINING 2 TO 15% BY WEIGHT OF SODIUM SUFOXYLATE FORMALDEHYDE AND 5 TO 10% BY WEIGHT OF DI-ETHANOLAMINE, STEAMING THE WET TEXTILE MATERIAL UNTIL THE INDIGOID VAT DYESTUFF IS REDUCED TO THE LEUCO FORM, AND THEN OXIDIZING THE LEUCO INDIGOID VAT DYESTUFF TO THE FINAL COLORED FORM IN AN AQUEOUS SOLUTION OF SODIUM DICHROMATE ACIDIFIED WITH ACETIC ACID.
References Cited (Backward Citations)
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Cited
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US2182963A
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FR708111A
Cited
GB479867A
Cited
US2415379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |