US2614993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silica sols from silicon metal
Assignee: EIDP Inc
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Filing: 1949-08-10
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Granted: 1952-10-21
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Expires: 1969-08-10
Abstract
No abstract record available.
Inventors
- 👤 Victor I Montenyohl
- 👤 Carl M Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/1412
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR THE PRODUCTION OF SILICA SOLS THROUGH REACTION OF SILICON WITH WATER WHICH COMPRISES EFFECTING SAID REACTION WHILE REMOVING SILICA COATING AS FORMED FROM THE SILICON REACTANT BY SUBJECTING SAID SILICON TO ATTRITION MILLING WHILE IT IS SUBMERGED IN AN AQUEOUS SOLUTION OF A WEAK BASE SELECTED FROM THE GROUP CONSISTING OF FROM 1% TO 28% BY WEIGHT OF AMMONIA AND FROM 1% TO 35% BY WEIGHT OF AMINES.
Claim 2
Dependent Claim
71 words
A PROCESS FOR THE PRODUCTION OF SILICA SOLS THROUGH REACTION OF SILICON WITH WATER WHICH COMPRISES EFFECTING SAID REACTION WHILE REMOVING SILICA COATING AS FORMED FROM THE SILICON REACTANT BY SUBJECTING SAID SILICON TO ATTRITION MILLING WHILE IT IS SUBMERGED IN AN AQUEOUS SOLUTION OF A WEAK BASE SELECTED FROM THE GROUP CONSISTING OF FROM 1% TO 28% BY WEIGHT OF AMMONIA AND FROM 1% TO 35% BY WEIGHT OF AMINES.
References Cited (Backward Citations)
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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) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |