US2933452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersant and method of making the same
Assignee: Lignosol Chemicals Ltd
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Filing: 1956-09-07
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Granted: 1960-04-19
•
Expires: 1976-09-07
Abstract
No abstract record available.
Inventors
- 👤 Gerald J Byrd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
THE METHOD OF MAKING A DISPERSANT FOR SOLID-INLIQUID SUSPENSIONS WHICH COMPRISES HEATING CONCENTRATED SODIUM BASE WASTE SULPHITE LIQUOR, CONTAINING SUBSTANTIALLY 50% SOLIDS AND HAVING A PH OF SUBSTANTIALLY 7, IN A CLOSED VESSEL AT A TEMPERATURE OF 270 TO 300*F., PASSING AIR INTO THE VESSEL TO OXIDIZE THE LIQUOR TO A PH OF 3.5 TO 4.5, MIXING WITH THE LIQUOR AN AQUEOUS SOLUTION OF AT LEAST ONE OF A GROUP CONSISTING OF SODIUM AND POTASSIUM DICHROMATE TO PROVIDE NOT LESS THAN 5 NOR MORE THAN 25% BY WEIGHT OF THE SOLIDS PRESENT OF THE DICHROMATE, CONTINUOUSLY MIXING THE DICHROMATE TO SUBSTANTIALLY REDUCE THE SOLIDS CONTENT OF THE MIXTURE TO AVOID GEL FORMATION AND SUBSTANTIALLY CONCURRENTLY SPRAY DRYING THE MIXTURE.
Claim 2
Independent Claim
119 words
THE METHOD OF MAKING A DISPERSANT FOR SOLID-INLIQUID SUSPENSIONS WHICH COMPRISES HEATING CONCENTRATED SODIUM BASE WASTE SULPHITE LIQUOR, CONTAINING SUBSTANTIALLY 50% SOLIDS AND HAVING A PH OF SUBSTANTIALLY 7, IN A CLOSED VESSEL AT A TEMPERATURE OF 270 TO 300*F., PASSING AIR INTO THE VESSEL TO OXIDIZE THE LIQUOR TO A PH OF 3.5 TO 4.5, MIXING WITH THE LIQUOR AN AQUEOUS SOLUTION OF AT LEAST ONE OF A GROUP CONSISTING OF SODIUM AND POTASSIUM DICHROMATE TO PROVIDE NOT LESS THAN 5 NOR MORE THAN 25% BY WEIGHT OF THE SOLIDS PRESENT OF THE DICHROMATE, CONTINUOUSLY MIXING THE DICHROMATE TO SUBSTANTIALLY REDUCE THE SOLIDS CONTENT OF THE MIXTURE TO AVOID GEL FORMATION AND SUBSTANTIALLY CONCURRENTLY SPRAY DRYING THE MIXTURE.
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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |