US3202480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved strength low density alumina spheres
Assignee: Universal Oil Products Co
•
Filing: 1961-04-06
•
Granted: 1965-08-24
•
Expires: 1981-04-06
Abstract
No abstract record available.
Inventors
- 👤 William G Nixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:53
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A METHOD FOR PRODUCING IMPROVED STRENGTH LOW DENSITY ALUMINA SPHERES WHICH COMPRISES DIGESTING ALUMINUM IN AN ACIDIC CHLORINE COMPOUND TO FORM A RESULTING ALUMINA SOL HAVING A RATIO OF ALUMINUM METAL TO CHLORIDE OF FROM ABOUT 1.15 TO ABOUT 1.50, ADDING HYDROGEN BROMIDE AND WATER TO SAID SOL TO INCREASE THE HALOGEN CONTENT THEREOF AND PROVIDE A REDUCED RATIO OF ALUMINUM METAL TO TOTAL HALOGEN PRESENT, ADDING AN ALKALINE MATERIAL HAVING A BUFFERING EFFECT WHICH SLOWS DOWN GELATION OF THE SOL AND MAINTAINS IT BELOW GELATION CONDITIONS, PASSING DROPLETS OF SAID SOL INTO AN OIL BATH AND FORMING HYDROGEL SPHERES THEREIN, THEREAFTER AGING AND DRYING TO COMPLETELY DRIVE OFF BROMINE FROM THE RESULTING SDPHERES TO FORM IMPROVED STRENGTH ALUMINA SPHERES.
Claim 2
Independent Claim
120 words
A METHOD FOR PRODUCING IMPROVED STRENGTH LOW DENSITY ALUMINA SPHERES WHICH COMPRISES DIGESTING ALUMINUM IN AN ACIDIC CHLORINE COMPOUND TO FORM A RESULTING ALUMINA SOL HAVING A RATIO OF ALUMINUM METAL TO CHLORIDE OF FROM ABOUT 1.15 TO ABOUT 1.50, ADDING HYDROGEN BROMIDE AND WATER TO SAID SOL TO INCREASE THE HALOGEN CONTENT THEREOF AND PROVIDE A REDUCED RATIO OF ALUMINUM METAL TO TOTAL HALOGEN PRESENT, ADDING AN ALKALINE MATERIAL HAVING A BUFFERING EFFECT WHICH SLOWS DOWN GELATION OF THE SOL AND MAINTAINS IT BELOW GELATION CONDITIONS, PASSING DROPLETS OF SAID SOL INTO AN OIL BATH AND FORMING HYDROGEL SPHERES THEREIN, THEREAFTER AGING AND DRYING TO COMPLETELY DRIVE OFF BROMINE FROM THE RESULTING SDPHERES TO FORM IMPROVED STRENGTH ALUMINA SPHERES.
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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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |