Patent US2524073A successfully refreshed from Google Patents.
US2524073A
Expired / Lapsed
US
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Dyeing cellulose esters and ethers with alkaline aqueous solutions of leuco vat dyes containing diacetone alcohol
Assignee: Celanese Corp
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Filing: 1948-07-13
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Granted: 1950-10-03
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Expires: 1968-07-13
Abstract
No abstract record available.
Inventors
- 👤 Olpin Henry Charles
- 👤 Stanley Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:55
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/34; D06P3/40; D06P3/403
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
PROCESS FOR THE COLORATION OF TEXTILE MATERIAL OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTERS OF ORGANIC ACIDS AND CELLULOSE ETHERS WITH A VAT DYE, WHICH COMPRISES ALLOWING THE MATERIAL TO SUBSTANTIALLY ABSORB THE LEUCO VAT DYE FROM AN AQUEOUS MEDIUM HAVING A PH VALUE BELOW 11.5 SAID MEDIUM CONTAINING AN ALKALI METAL SALT OF AN ACID OF DISSOLUTION CONSTANT LESS THAN 10**-5 AND CONTAINING SUFFICIENT DIACETONE ALCOHOL TO IMPART TO THE MEDIUM A SUBSTANTIAL SWELLING ACTION ON THE CELLULOSE DERIVATIVE, AND THEREAFTER DIRECTLY WASHING THE MATERIAL AND OXIDIZING THE LEUCO COMPOUND TO THE PARENT VAT DYE.
Claim 2
Dependent Claim
100 words
PROCESS FOR THE COLORATION OF TEXTILE MATERIAL OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTERS OF ORGANIC ACIDS AND CELLULOSE ETHERS WITH A VAT DYE, WHICH COMPRISES ALLOWING THE MATERIAL TO SUBSTANTIALLY ABSORB THE LEUCO VAT DYE FROM AN AQUEOUS MEDIUM HAVING A PH VALUE BELOW 11.5 SAID MEDIUM CONTAINING AN ALKALI METAL SALT OF AN ACID OF DISSOLUTION CONSTANT LESS THAN 10**-5 AND CONTAINING SUFFICIENT DIACETONE ALCOHOL TO IMPART TO THE MEDIUM A SUBSTANTIAL SWELLING ACTION ON THE CELLULOSE DERIVATIVE, AND THEREAFTER DIRECTLY WASHING THE MATERIAL AND OXIDIZING THE LEUCO COMPOUND TO THE PARENT VAT DYE.
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) | 1953-10-02 | 1954-04-03 | 1954-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-02 | 1958-04-03 | 1958-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-02 | 1962-04-03 | 1962-10-03 | $7700.00 | Window Closed / Lapsed |