US2574597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray-dried dyestuff powders comprising lignin sulfonate
Assignee: Celanese Corp
•
Filing: 1949-03-03
•
Granted: 1951-11-13
•
Expires: 1969-03-03
Abstract
No abstract record available.
Inventors
- 👤 Victor S Salvin
- 👤 William J Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:29
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0003; C09B67/0096
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN A PROCESS FOR THE PRODUCTION OF DISPERSE DYESTUFF POWDERS, THE STEPS WHICH COMPRISE MILLING A PASTE CONSISTING OF 20 TO 50 PARTS BY WEIGHT OF A DYESTUFF, 25 TO 40 PARTS BY WEIGHT OF LIGNIN SULFONATE AND 25 TO 40 PARTS BY WEIGHT OF AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF NEUTRAL AND ALKALINE SALTS OF CATIONS WHICH ARE INCAPABLE OF FORMING INSOLUBLE SOAPS, AND WATER IN SUCH AMOUNT THAT THE TOTAL SOLIDS CONTENT OF SAID SLURRY IS FROM 30 TO 50% BY WEIGHT OF THE MIXTURE, REDUCING THE AQUEOUS MILLED SLURRY TO FINELY-DIVIDED DROPLETS, AND DRYING THE FINELYDIVIDED DROPLETS TO A MOISTURE CONTENT OF FROM ABOUT 2 ABOUT 5% BY WEIGHT BY BRINGING THE LATTER INTO CONTACT WITH HEATED AIR.
Claim 2
Dependent Claim
124 words
IN A PROCESS FOR THE PRODUCTION OF DISPERSE DYESTUFF POWDERS, THE STEPS WHICH COMPRISE MILLING A PASTE CONSISTING OF 20 TO 50 PARTS BY WEIGHT OF A DYESTUFF, 25 TO 40 PARTS BY WEIGHT OF LIGNIN SULFONATE AND 25 TO 40 PARTS BY WEIGHT OF AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF NEUTRAL AND ALKALINE SALTS OF CATIONS WHICH ARE INCAPABLE OF FORMING INSOLUBLE SOAPS, AND WATER IN SUCH AMOUNT THAT THE TOTAL SOLIDS CONTENT OF SAID SLURRY IS FROM 30 TO 50% BY WEIGHT OF THE MIXTURE, REDUCING THE AQUEOUS MILLED SLURRY TO FINELY-DIVIDED DROPLETS, AND DRYING THE FINELYDIVIDED DROPLETS TO A MOISTURE CONTENT OF FROM ABOUT 2 ABOUT 5% BY WEIGHT BY BRINGING THE LATTER INTO CONTACT WITH HEATED AIR.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |