US3305304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of phosphorus-containing solutions
Assignee: Hooker Chemical Corp
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Filing: 1962-11-23
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Granted: 1967-02-21
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Expires: 1982-11-23
Abstract
No abstract record available.
Inventors
- 👤 John A Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:31
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/30; C01B25/308
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR PURIFYING AN AQUEOUS ALKALI METAL PHOSPHATE SOLUTION CONTAINING SILICON VALUES AS IMPURITIES WHICH COMPRISES ADJUSTING THE PH OF THE ALKALI METAL PHOSPHATE SOLUTION TO WITHIN THE RANGE OF ABOUT 8.0 TO ABOUT 9.0 AND MAINTAINING THE SOLUTION AT AN ELEVATED TEMPERATURE ABOVE ABOUT 80 DEGREES CENTIGRADE FOR A PERIOD OF TIME SUFFICIENT TO EFFECT FORMATION AND COAGULATION OF A PRECIPITATE OF SILICON VALUES IN THE SOLUTION, THE ELEVATED TEMPERATURE BEING MAINTAINED DURING THE TIME IN THE PROCESS WHEN THE SILICON VALUES ARE BEING PRECIPITATED.
Claim 2
Dependent Claim
87 words
A PROCESS FOR PURIFYING AN AQUEOUS ALKALI METAL PHOSPHATE SOLUTION CONTAINING SILICON VALUES AS IMPURITIES WHICH COMPRISES ADJUSTING THE PH OF THE ALKALI METAL PHOSPHATE SOLUTION TO WITHIN THE RANGE OF ABOUT 8.0 TO ABOUT 9.0 AND MAINTAINING THE SOLUTION AT AN ELEVATED TEMPERATURE ABOVE ABOUT 80 DEGREES CENTIGRADE FOR A PERIOD OF TIME SUFFICIENT TO EFFECT FORMATION AND COAGULATION OF A PRECIPITATE OF SILICON VALUES IN THE SOLUTION, THE ELEVATED TEMPERATURE BEING MAINTAINED DURING THE TIME IN THE PROCESS WHEN THE SILICON VALUES ARE BEING PRECIPITATED.
References Cited (Backward Citations)
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US1891293A
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Cited
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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 |