US2567140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of an iron oxide-magnesium chromate catalyst
Assignee: Wyeth Holdings LLC
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Filing: 1949-06-21
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Granted: 1951-09-04
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Expires: 1969-06-21
Abstract
No abstract record available.
Inventors
- 👤 Kenneth D Ashley
- 👤 William B Innes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:06
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/06; C01B3/12; C01B3/16; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/862; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD OF PRODUCING AN IRON OXIDE-MAGNESIA CATALYST OF HIGH ACTIVITY AND IMPROVED MECHANICAL STRENGTH WHICH COMPRISES PREPARING A MIXTURE OF FE2O3, ABOUT 10-100% OF "ACTIVE MAGNESIA" BASED ON THE WEIGHT OF THE IRON OXIDE AND ABOUT 3-40% OF MAGNESIUM CHROMATE AND SUFFICIENT WATER TO HYDRATE ALL OF THE MAGNESIA, COMPRESSING SAID MIXTURE INTO PELLETS, AGING THE PELLETS WHILE RETAINING THEIR WATER CONTENT TO FORM THEREIN A SET HYDRAULIC CEMENT, AND SUBSEQUENTLY DEHYDRATING THE PELLETS BY CALCINING THEM AT 500*650* C.
Claim 2
Independent Claim
81 words
A METHOD OF PRODUCING AN IRON OXIDE-MAGNESIA CATALYST OF HIGH ACTIVITY AND IMPROVED MECHANICAL STRENGTH WHICH COMPRISES PREPARING A MIXTURE OF FE2O3, ABOUT 10-100% OF "ACTIVE MAGNESIA" BASED ON THE WEIGHT OF THE IRON OXIDE AND ABOUT 3-40% OF MAGNESIUM CHROMATE AND SUFFICIENT WATER TO HYDRATE ALL OF THE MAGNESIA, COMPRESSING SAID MIXTURE INTO PELLETS, AGING THE PELLETS WHILE RETAINING THEIR WATER CONTENT TO FORM THEREIN A SET HYDRAULIC CEMENT, AND SUBSEQUENTLY DEHYDRATING THE PELLETS BY CALCINING THEM AT 500*650* C.
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) | 1954-09-03 | 1955-03-05 | 1955-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-03 | 1959-03-05 | 1959-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-03 | 1963-03-05 | 1963-09-04 | $7700.00 | Window Closed / Lapsed |