US3305305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of phosphate solutions
Assignee: Hooker Chemical Corp
•
Filing: 1962-12-26
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Granted: 1967-02-21
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Expires: 1982-12-26
Abstract
No abstract record available.
Inventors
- 👤 John A Peterson
- 👤 Rufus G Hartig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:13
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/30; C01B25/308
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR PURIFYING AN AQUEOUS ALKALI METL PHOSPHATE SOLUTION CONTAINING VANADIUM IMPURITIES AND HAVING A PH WHICH IS NOT IN EXCESS OF ABOUT 8.0, WHICH COMPRISES ADJUSTING THE PH OF THE ALKALI METAL PHOSPHATE SOLUTION TO WITHIN THE RANGE OF ABOUT , 8.0 TO ABOUT .90, ADJUSTING THE PHOSPHORUS CONCENTRATION OF THE SOLUTION TO WITHIN THE RANGE OF ABOUT 7.0 TO ABOUT 9.5 PERCENT PHOSPHORUS BY WEIGHT OF THE SOLUTION, MAINTAINING THE THUS-ADJUSTED SOLUTION AT AN ELEVATED TEMPERATURE ABOVE ABOUT EIGHTY DEGREES CENTIGRADE WHILE ADDING FERROUS IONS TO THE SOLUTION IN AN AMOUNT AT LEAST SUFFICIENT TO REDUCE VANADIUM PRESENT TO AT LEAST THE TETRAVALENT STATE, EFFECTING FORMATION OF A PRECIPITATE CONTAINING SUCH REDUCED VANADIUM AND SEPARATING SAID PRECIPITATE FROM THE SOLUTION.
Claim 2
Dependent Claim
123 words
A PROCESS FOR PURIFYING AN AQUEOUS ALKALI METL PHOSPHATE SOLUTION CONTAINING VANADIUM IMPURITIES AND HAVING A PH WHICH IS NOT IN EXCESS OF ABOUT 8.0, WHICH COMPRISES ADJUSTING THE PH OF THE ALKALI METAL PHOSPHATE SOLUTION TO WITHIN THE RANGE OF ABOUT , 8.0 TO ABOUT .90, ADJUSTING THE PHOSPHORUS CONCENTRATION OF THE SOLUTION TO WITHIN THE RANGE OF ABOUT 7.0 TO ABOUT 9.5 PERCENT PHOSPHORUS BY WEIGHT OF THE SOLUTION, MAINTAINING THE THUS-ADJUSTED SOLUTION AT AN ELEVATED TEMPERATURE ABOVE ABOUT EIGHTY DEGREES CENTIGRADE WHILE ADDING FERROUS IONS TO THE SOLUTION IN AN AMOUNT AT LEAST SUFFICIENT TO REDUCE VANADIUM PRESENT TO AT LEAST THE TETRAVALENT STATE, EFFECTING FORMATION OF A PRECIPITATE CONTAINING SUCH REDUCED VANADIUM AND SEPARATING SAID PRECIPITATE FROM THE SOLUTION.
References Cited (Backward Citations)
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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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |