US2532497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of inorganic oxide particles
Assignee: Universal Oil Products Co
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Filing: 1947-05-28
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Granted: 1950-12-05
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Expires: 1967-05-28
Abstract
No abstract record available.
Inventors
- 👤 Hoekstra James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:35
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/14; B01J21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD OF PREPARING SILICA PARTICLES OF LOW DENSITY AND OF SUBSTANTIALLY EVENLY DISTRIBUTED UNIFORM PORES, WHICH COMPRISES COMMINGLING AN ACID, AN ALKALI METAL SILICATE AND A SOAP SOLUTION CONTAINING AT LEAST 0.01% OF AN ALKALI METAL SOAP, REACTING THE MIXTURE UNDER A PH CONTROLLED TO FORM SILICA PARTICLES CONTAINING SOAP MOLECULES, THEREAFTER DRYING THE SAME TO FORM FIRM SILICA PARTICLES, AND WASHING THE DRIED PARTICLES TO REMOVE SOAP MOLECULES.
Claim 2
Independent Claim
70 words
A METHOD OF PREPARING SILICA PARTICLES OF LOW DENSITY AND OF SUBSTANTIALLY EVENLY DISTRIBUTED UNIFORM PORES, WHICH COMPRISES COMMINGLING AN ACID, AN ALKALI METAL SILICATE AND A SOAP SOLUTION CONTAINING AT LEAST 0.01% OF AN ALKALI METAL SOAP, REACTING THE MIXTURE UNDER A PH CONTROLLED TO FORM SILICA PARTICLES CONTAINING SOAP MOLECULES, THEREAFTER DRYING THE SAME TO FORM FIRM SILICA PARTICLES, AND WASHING THE DRIED PARTICLES TO REMOVE SOAP MOLECULES.
References Cited (Backward Citations)
GB222279A
Cited
US1748315A
Cited
US1896320A
Cited
US2093454A
Cited
US2211208A
Cited
US2442884A
Cited
US2384946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |