US2897159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst manufacture
Assignee: Universal Oil Products Co
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Filing: 1956-06-25
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Granted: 1959-07-28
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Expires: 1976-06-25
Abstract
No abstract record available.
Inventors
- 👤 Hoekstra James
- 👤 Michalko Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:08
CPC Classifications
C; C01; C01G; C01G49/00; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; C22; C22C; C22C9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD FOR PREPARING SPHERICAL ALUMINA-IRON OXIDE PARTICLES CONTAINING FROM ABOUT 10% TO ABOUT 35% BY WEIGHT OF IRON WHICH COMPRISES OXIDIZING AN ALUMINA-IRON HYDROSOL CONTAINING SUFFICIENT IRON TO YIELD AN ULTIMATE COMPOSITE CONTAINING FROM ABOUT 10% TO ABOUT 35% BY WEIGHT OF IRON UNTIL SUBSTANTIALLY ALL OF THE IRON IS IN THE FERRICS STATE, BLENDING HEXAMETHYLENETETRAMINE WITH THE OXIDIZED HYDROSOL AND DISPERSING THE MIXTURE IN THE FORM OF DROPLETS IN A WATER-IMMISCIBLE GELLING MEDIUM, REMOVING THE RESULTANT ALUMINA-IRON HYDROGEL SPHERES FROM THE GELLING MEDIUM AND DRYING THEM TO PRODUCE THE DESIRED ALUMINA-IRON OXIDE PARTICLES.
Claim 2
Independent Claim
95 words
A METHOD FOR PREPARING SPHERICAL ALUMINA-IRON OXIDE PARTICLES CONTAINING FROM ABOUT 10% TO ABOUT 35% BY WEIGHT OF IRON WHICH COMPRISES OXIDIZING AN ALUMINA-IRON HYDROSOL CONTAINING SUFFICIENT IRON TO YIELD AN ULTIMATE COMPOSITE CONTAINING FROM ABOUT 10% TO ABOUT 35% BY WEIGHT OF IRON UNTIL SUBSTANTIALLY ALL OF THE IRON IS IN THE FERRICS STATE, BLENDING HEXAMETHYLENETETRAMINE WITH THE OXIDIZED HYDROSOL AND DISPERSING THE MIXTURE IN THE FORM OF DROPLETS IN A WATER-IMMISCIBLE GELLING MEDIUM, REMOVING THE RESULTANT ALUMINA-IRON HYDROGEL SPHERES FROM THE GELLING MEDIUM AND DRYING THEM TO PRODUCE THE DESIRED ALUMINA-IRON OXIDE PARTICLES.
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) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |