US2773845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of chromia-alumina hydrogel
Assignee: ExxonMobil Oil Corp
•
Filing: 1952-07-30
•
Granted: 1956-12-11
•
Expires: 1972-07-30
Abstract
No abstract record available.
Inventors
- 👤 William A Stover
- 👤 Jr Robert C Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:18
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE PRODUCTION OF A CHROMIA-ALUMINA CO-GEL PREPARED BY MIXING AQUEOUS SOLUTIONS OF SODIUM ALUMINATE AND CHROMIUM ACETATE TO YIELD A HYDROSOL HAVING A CHROMIA-ALUMINA CONTENT OF AT LEAST ABOUT XXXX PERCENT BY WEIGHT AND CONTROLLING THE SODIUM TO ALUMINUM ION RATIO AND THE ACETATE TO CHROMIUM ION RATIO IN SAID SOLUTIONS TO EFFECT RAPID GELATION OF SAID HYDROSOL TO A HYDROGEL AND WATER-WASHING AND DRYING THE RESULTING HYDROGEL, THE IMPROVEMENT WHICH COMPRISES AGING SAID HYDROGEL, BEFORE SAID WASHING, FOR AT LEAST 2 HOURS IN AN ALKALINE MEDIUM HAVING A PH BETWEEN 8.0 AND 9.5.
Claim 2
Dependent Claim
95 words
IN THE PRODUCTION OF A CHROMIA-ALUMINA CO-GEL PREPARED BY MIXING AQUEOUS SOLUTIONS OF SODIUM ALUMINATE AND CHROMIUM ACETATE TO YIELD A HYDROSOL HAVING A CHROMIA-ALUMINA CONTENT OF AT LEAST ABOUT XXXX PERCENT BY WEIGHT AND CONTROLLING THE SODIUM TO ALUMINUM ION RATIO AND THE ACETATE TO CHROMIUM ION RATIO IN SAID SOLUTIONS TO EFFECT RAPID GELATION OF SAID HYDROSOL TO A HYDROGEL AND WATER-WASHING AND DRYING THE RESULTING HYDROGEL, THE IMPROVEMENT WHICH COMPRISES AGING SAID HYDROGEL, BEFORE SAID WASHING, FOR AT LEAST 2 HOURS IN AN ALKALINE MEDIUM HAVING A PH BETWEEN 8.0 AND 9.5.
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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |