US2666749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spheroidal alumina
Assignee: Universal Oil Products Co
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Filing: 1951-11-21
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Granted: 1954-01-19
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Expires: 1971-11-21
Abstract
No abstract record available.
Inventors
- 👤 Hoekstra James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:58
CPC Classifications
B; B01; B01J; B01J21/00; B01J13/00; C; C01; C01F; C01F7/00; C01F7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD OF PREPARING SUBSTANTIALLY SPHERICAL ALUMINA PARTICLES WHICH COMPRISES FORMING ALUMINA SOL, COMMINGLING SAID SOL WITH WATER TO FORM A MIXTURE CONTAINING FROM ABOUT 15% TO ABOUT 35% BY WEIGHT OF ALUMINA, SEPARATELY COMMINGLING AMMONIUM ACETATE WITH WATER AND ADDING AMMONIUM HYDROXIDE THERETO IN AN AMOUNT TO REGULATE THE PH OF THE RESULTANT MIXTURE TO BELOW ABOUT 8.5, COMMINGLING SAID AMMONIUM ACETATE-AMMONIUM HYDROXIDE SOLUTION WITH THE ALUMINA SOL AT A TEMPERATURE BELOW ABOUT 110* F. AND MAINTAINING THE MIXTURE AT BELOW ABOUT 110* F. TO PREVENT GELATION THEREOF, THEREAFTER PASSING DROPLETS OF THE UNGELLED MIXTURE INTO AN OIL BATH MAINTAINED AT A TEMPERATURE OF FROM ABOUT 120* TO ABOUT 220* F., RETAINING THE DROPLETS IN SAID OIL BATH UNTIL THE DROPLETS SET TO HYDROGEL SPHERES, AND IMMEDIATELY THREREAFTER AGING SAID HYDROGEL SPHERES IN A BASIC MEDIUM.
Claim 2
Independent Claim
137 words
A METHOD OF PREPARING SUBSTANTIALLY SPHERICAL ALUMINA PARTICLES WHICH COMPRISES FORMING ALUMINA SOL, COMMINGLING SAID SOL WITH WATER TO FORM A MIXTURE CONTAINING FROM ABOUT 15% TO ABOUT 35% BY WEIGHT OF ALUMINA, SEPARATELY COMMINGLING AMMONIUM ACETATE WITH WATER AND ADDING AMMONIUM HYDROXIDE THERETO IN AN AMOUNT TO REGULATE THE PH OF THE RESULTANT MIXTURE TO BELOW ABOUT 8.5, COMMINGLING SAID AMMONIUM ACETATE-AMMONIUM HYDROXIDE SOLUTION WITH THE ALUMINA SOL AT A TEMPERATURE BELOW ABOUT 110* F. AND MAINTAINING THE MIXTURE AT BELOW ABOUT 110* F. TO PREVENT GELATION THEREOF, THEREAFTER PASSING DROPLETS OF THE UNGELLED MIXTURE INTO AN OIL BATH MAINTAINED AT A TEMPERATURE OF FROM ABOUT 120* TO ABOUT 220* F., RETAINING THE DROPLETS IN SAID OIL BATH UNTIL THE DROPLETS SET TO HYDROGEL SPHERES, AND IMMEDIATELY THREREAFTER AGING SAID HYDROGEL SPHERES IN A BASIC MEDIUM.
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |