US2863727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of silica
Assignee: Columbia Southern Chemical Corp
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Filing: 1957-01-28
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Granted: 1958-12-09
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Expires: 1977-01-28
Abstract
No abstract record available.
Inventors
- 👤 Fred S Thornhill
- 👤 James E Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:30
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; B; B82; B82Y; B82Y30/00; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/22; C01P2006/80; C01P2006/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF REMOVING WATER FROM A SILICA SLURRY IN A FINELY DIVIDED FILTERABLE FORM WHICH COMPRISES FILTERING THE SLURRY WHILE THE PH THEREOF IS ABOVE 5 TO PRODUCE A FILTER CAKE CONTAINING AT LEAST 12 PERCENT BY WEIGHT OF SOLIDS AND THEREBY TO PRODUCE A FILTER CAKE HAVING A PH OF AT LEAST 6, AND ADJUSTING THE PH OF THE FILTER CAKE BELOW 5.75 WHILE MAINTAINING THE SOLIDS CONTENT OF THE RESULTING PRODUCT AT LEAST 12 PERCENT BY WEIGHT AND THEREBY PRODUCING A FLUID SLURRY.
Claim 2
Independent Claim
86 words
A METHOD OF REMOVING WATER FROM A SILICA SLURRY IN A FINELY DIVIDED FILTERABLE FORM WHICH COMPRISES FILTERING THE SLURRY WHILE THE PH THEREOF IS ABOVE 5 TO PRODUCE A FILTER CAKE CONTAINING AT LEAST 12 PERCENT BY WEIGHT OF SOLIDS AND THEREBY TO PRODUCE A FILTER CAKE HAVING A PH OF AT LEAST 6, AND ADJUSTING THE PH OF THE FILTER CAKE BELOW 5.75 WHILE MAINTAINING THE SOLIDS CONTENT OF THE RESULTING PRODUCT AT LEAST 12 PERCENT BY WEIGHT AND THEREBY PRODUCING A FLUID SLURRY.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |