US3216953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making vanadium oxide-potassium oxide catalysts of selected porosity
Assignee: Compagnie de Saint Gobain SA
•
Filing: 1962-08-16
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Granted: 1965-11-09
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Expires: 1982-08-16
Abstract
No abstract record available.
Inventors
- 👤 Krempff Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:37
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/78; C01B17/79; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A METHOD OF MAKING VANADIUM OXIDE-POTASSIUM OXIDE-SILICA CATALYSTS HAVING 3 TO 20% K2O, 3 TO 15% V2O5, AND THE BALANCE BEING SIO2 HAVING PORES A MAJORITY OF WHICH ARE IN THE RANGE OF RADII OF 50 TO 500 A. WHICH COMPRISES MIXING AQUEOUS KOH WITH V2O5 AND DILUTE SULPHURIC ACID IN SUCH QUANTITY THAT THE KOH IS NOT WHOLLY NEUTRALIZED, MIXING THE SULPHATED REACTION PRODUCT WITH NH4OH AND THE PRODUCT WITH SILICA PARTICLES HAVING DIAMETERS ON THE OUTER OF SEVERAL TENS TO SEVERAL HUNDREDS OF A., DRYING THE MASS AT NOT SUBSTANTIALLY OVER 100*C., AND CALCINING THE DRIED PRODUCT CIRCA 400-500*C.
Claim 2
Independent Claim
101 words
A METHOD OF MAKING VANADIUM OXIDE-POTASSIUM OXIDE-SILICA CATALYSTS HAVING 3 TO 20% K2O, 3 TO 15% V2O5, AND THE BALANCE BEING SIO2 HAVING PORES A MAJORITY OF WHICH ARE IN THE RANGE OF RADII OF 50 TO 500 A. WHICH COMPRISES MIXING AQUEOUS KOH WITH V2O5 AND DILUTE SULPHURIC ACID IN SUCH QUANTITY THAT THE KOH IS NOT WHOLLY NEUTRALIZED, MIXING THE SULPHATED REACTION PRODUCT WITH NH4OH AND THE PRODUCT WITH SILICA PARTICLES HAVING DIAMETERS ON THE OUTER OF SEVERAL TENS TO SEVERAL HUNDREDS OF A., DRYING THE MASS AT NOT SUBSTANTIALLY OVER 100*C., AND CALCINING THE DRIED PRODUCT CIRCA 400-500*C.
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |