Patent US2964481A successfully refreshed from Google Patents.
US2964481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of attrition-resistant siliceous gels
Assignee: ExxonMobil Oil Corp
•
Filing: 1957-05-03
•
Granted: 1960-12-13
•
Expires: 1977-05-03
Abstract
No abstract record available.
Inventors
- 👤 Robert H Cramer
- 👤 Albert B Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:07
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; B; B01; B01J; B01J21/00; B01J21/12; C10; C10G; C10G45/00; C10G45/02; C10G45/04; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/504
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
A METHOD FOR PREPARING SPHEROIDAL PARTICLES OF A SILICA-ALUMINA GEL CHARACTERIZED BY HIGH RESISTANCE TO AT TRITION, WHICH COMPRISES DISPERSING IN SODIUM SILICATE SOLUTION AN AMOUNT, BASED ON THE DRIED GEL TO BE PRODUCED, OF BETWEEN ABOUT 15 AND ABOUT 30 PERCENT BY VOLUME OF A POWERED SILICA-ALUMINA GEL SUBSTANTIALLY INSOLUBLE THEREIN HAVING A WEIGHT MEAN PARTICLE DIAMETER OF BETWEEN 2 AND 4 MICRONS, MAINTAINING CONTACT BETWEEN SAID POWDERED GEL AND SAID SILICATE SOLUTION FOR A TIME OF BETWEEN .005 AND 1 HOUR AT A TEMPERATURE IN THE APPROXI MATE RANGE OF 70*F TO 90*F., SAID TIME AND TEMPERATURE BEING CORRELATED TO LIE WITHIN THE AREA ABCD OF FIG. 5 OF THE ACCOMPANYING DRAWING, THEREAFTER MIXING THE RESULTING SOLUTION CONTAINING POWDER WITH AN ACIDIC ALUMINUM SALT SOLUTION TO YIELD A SILICA-ALUMINA HYDROSOL, INTRODUCING GLOBULES OF SAID HYDROSOL INTO A COLUMN OF WATER-IMMISCIBLE LIQUID WHEREIN THE GLOBULES OF HYDROSOL SET TO SPHEROIDAL HYDROGEL EFFECTING GELATION OF SAID SPHEROIDAL HYDROSOL PARTICLES AND DRYING THE RESULTING SPHEROIDAL PARTICLES OF HYDROGEL AT A TEMPERATURE BELOW THE FUSION POINT OF SAID POWDERED GEL.
Claim 2
Independent Claim
178 words
A METHOD FOR PREPARING SPHEROIDAL PARTICLES OF A SILICA-ALUMINA GEL CHARACTERIZED BY HIGH RESISTANCE TO AT TRITION, WHICH COMPRISES DISPERSING IN SODIUM SILICATE SOLUTION AN AMOUNT, BASED ON THE DRIED GEL TO BE PRODUCED, OF BETWEEN ABOUT 15 AND ABOUT 30 PERCENT BY VOLUME OF A POWERED SILICA-ALUMINA GEL SUBSTANTIALLY INSOLUBLE THEREIN HAVING A WEIGHT MEAN PARTICLE DIAMETER OF BETWEEN 2 AND 4 MICRONS, MAINTAINING CONTACT BETWEEN SAID POWDERED GEL AND SAID SILICATE SOLUTION FOR A TIME OF BETWEEN .005 AND 1 HOUR AT A TEMPERATURE IN THE APPROXI MATE RANGE OF 70*F TO 90*F., SAID TIME AND TEMPERATURE BEING CORRELATED TO LIE WITHIN THE AREA ABCD OF FIG. 5 OF THE ACCOMPANYING DRAWING, THEREAFTER MIXING THE RESULTING SOLUTION CONTAINING POWDER WITH AN ACIDIC ALUMINUM SALT SOLUTION TO YIELD A SILICA-ALUMINA HYDROSOL, INTRODUCING GLOBULES OF SAID HYDROSOL INTO A COLUMN OF WATER-IMMISCIBLE LIQUID WHEREIN THE GLOBULES OF HYDROSOL SET TO SPHEROIDAL HYDROGEL EFFECTING GELATION OF SAID SPHEROIDAL HYDROSOL PARTICLES AND DRYING THE RESULTING SPHEROIDAL PARTICLES OF HYDROGEL AT A TEMPERATURE BELOW THE FUSION POINT OF SAID POWDERED GEL.
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) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |