US2935377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starch-borax settling aid and process of using
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1957-08-23
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Granted: 1960-05-03
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Expires: 1977-08-23
Abstract
No abstract record available.
Inventors
- 👤 Robert L Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:33
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/0646; C01F7/0653
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN A PROCESS OF REFINING ALUMINOUS ORES FOR THE RECOVERY OF ALUMINA WHICH INCLUDES A DIGESTION OF THE ORES IN CAUSTIC LIQUORS TO EXTRACT THE ALUMINA VALUES AND A SUBSEQUENT CLARIFICATION STEP TO REMOVE THE CAUSTIC-INSOLUBLE ORE MATERIALS WHICH REMAIN SUSPENDED IN THE RESULTING CAUSTIC ALUMINATE LIQUOR, THE IMPROVEMENT IN REMOVING THE SAID INSOLUBLE ORE MATERIALS FROM THE LIQUOR WHICH COMPRISES ADDING TO SAID LIQUOR A SETTLING AID PREPARED BY HEATING FOR A PERIOD OF ABOUT 5 TO 15 MINUTES AT A TEMPERATURE OF ABOUT 85 TO 100*C. AN AQUEOUS MIXTURE COMPRISING 20 TO 60 GRAMS OF STARCH PER LITER, 10 TO 200 GRAMS OF CAUSTIC SODA PER LITER, AND A BORON COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM TETRABORATE, SODIUM TETRABORATE PENTAHYDRATE, SODIUM TETRABORATE DECAHYDRATE, AND BORIC ANHYDRIDE, SAID BORON COMPOUND BEING PRESENT IN STOICHIOMETRIC WEIGHT EQUIVALENT AMOUNTS OF SODIUM TETRABORATE PENTAHYDRATE OF FROM ABOUT 2% TO ABOUT 6% OF THE WEIGHT OF THE DRY STARCH.
Claim 2
Dependent Claim
158 words
IN A PROCESS OF REFINING ALUMINOUS ORES FOR THE RECOVERY OF ALUMINA WHICH INCLUDES A DIGESTION OF THE ORES IN CAUSTIC LIQUORS TO EXTRACT THE ALUMINA VALUES AND A SUBSEQUENT CLARIFICATION STEP TO REMOVE THE CAUSTIC-INSOLUBLE ORE MATERIALS WHICH REMAIN SUSPENDED IN THE RESULTING CAUSTIC ALUMINATE LIQUOR, THE IMPROVEMENT IN REMOVING THE SAID INSOLUBLE ORE MATERIALS FROM THE LIQUOR WHICH COMPRISES ADDING TO SAID LIQUOR A SETTLING AID PREPARED BY HEATING FOR A PERIOD OF ABOUT 5 TO 15 MINUTES AT A TEMPERATURE OF ABOUT 85 TO 100*C. AN AQUEOUS MIXTURE COMPRISING 20 TO 60 GRAMS OF STARCH PER LITER, 10 TO 200 GRAMS OF CAUSTIC SODA PER LITER, AND A BORON COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM TETRABORATE, SODIUM TETRABORATE PENTAHYDRATE, SODIUM TETRABORATE DECAHYDRATE, AND BORIC ANHYDRIDE, SAID BORON COMPOUND BEING PRESENT IN STOICHIOMETRIC WEIGHT EQUIVALENT AMOUNTS OF SODIUM TETRABORATE PENTAHYDRATE OF FROM ABOUT 2% TO ABOUT 6% OF THE WEIGHT OF THE DRY STARCH.
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |