US2525073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesia-ceria and magnesiaberyllia catalysts
Assignee: Standard Oil Development Co
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Filing: 1950-03-22
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Granted: 1950-10-10
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Expires: 1970-03-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles N Kimberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:55
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
AN IMPROVED PROCESS FOR THE PREPARATION OF TRUE HYDROGELS WHICH CONSISTS ESSENTIALLY IN PREPARING AN AQUEOUS SOLUTION OF A SOLUBLE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CERIUM AND BERYLIUM IN AMOUNT SUFFICIENT TO PRODUCE A CONCENTRATION IN THE PRODUCT OF AT LEAST 50 G. OF METAL OXIDE PER LITER AND ADDING TO SAID SOLUTION AT LEAST A STOICHIOMETRICALLY EQUIVALENT AMOUNT OF MAGNESIA TO FORM A TRUE HYDROGEL OF THE SAID METAL.
Claim 2
Dependent Claim
75 words
AN IMPROVED PROCESS FOR THE PREPARATION OF TRUE HYDROGELS WHICH CONSISTS ESSENTIALLY IN PREPARING AN AQUEOUS SOLUTION OF A SOLUBLE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF CERIUM AND BERYLIUM IN AMOUNT SUFFICIENT TO PRODUCE A CONCENTRATION IN THE PRODUCT OF AT LEAST 50 G. OF METAL OXIDE PER LITER AND ADDING TO SAID SOLUTION AT LEAST A STOICHIOMETRICALLY EQUIVALENT AMOUNT OF MAGNESIA TO FORM A TRUE HYDROGEL OF THE SAID METAL.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |