US2941957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of oxidation catalysts
Assignee: COAL TAR RES ASS
•
Filing: 1957-01-02
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Granted: 1960-06-21
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Expires: 1977-01-02
Abstract
No abstract record available.
Inventors
- 👤 Peter H Pinchbeck
- 👤 Felix B Popper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:16
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/89; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF PRODUCING AN ACTIVE VANADIUM OXIDE/POTASSIUM SULPHATE/SILICA CATALYST SUITABLE FOR FLUID BED CATALYSTS FROM MICROSPHERICAL SILICA PARTICLES FORMED BY GELLING IN AN IMMISCIBLE ORGANIC LIQUID A DISPERSE PRECIPITATED AQUEOUS SILICA SOL, WITHIN COMPRISES WASHING THE PARTICLES FREE OF SODIUM AND ACID IONS, TREATING THE WASHED PARTICLES WITH LIVE STEAM TO REMOVE RESIDUAL ORGANIC LIQUID, IMPREGNATING THE SO-CLEANED PARTICLES WITH THE DESIRED AMOUNTS OF SODIUM-FREE VANDADIUM SALT AND POTASSIUM SULPHATE IN AQUEOUS SOLUTION, DRYING THE IMPREGNATED PARTICLES AT UP TO 100*C. AND THEN CALCINING IN AIR AT 350-450*C.
Claim 2
Independent Claim
89 words
THE METHOD OF PRODUCING AN ACTIVE VANADIUM OXIDE/POTASSIUM SULPHATE/SILICA CATALYST SUITABLE FOR FLUID BED CATALYSTS FROM MICROSPHERICAL SILICA PARTICLES FORMED BY GELLING IN AN IMMISCIBLE ORGANIC LIQUID A DISPERSE PRECIPITATED AQUEOUS SILICA SOL, WITHIN COMPRISES WASHING THE PARTICLES FREE OF SODIUM AND ACID IONS, TREATING THE WASHED PARTICLES WITH LIVE STEAM TO REMOVE RESIDUAL ORGANIC LIQUID, IMPREGNATING THE SO-CLEANED PARTICLES WITH THE DESIRED AMOUNTS OF SODIUM-FREE VANDADIUM SALT AND POTASSIUM SULPHATE IN AQUEOUS SOLUTION, DRYING THE IMPREGNATED PARTICLES AT UP TO 100*C. AND THEN CALCINING IN AIR AT 350-450*C.
References Cited (Backward Citations)
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US2027316A
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US2647875A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |