US3226338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vanadium pentoxide potassium pyrosulfate catalyst and method of preparation thereof
Assignee: United Coke and Chemical Co
•
Filing: 1961-01-03
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Granted: 1965-12-28
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Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Riley Harry Lister
- 👤 Romanski Andrzej
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:34
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/70; B01J27/00; B01J27/02; B01J27/06; B01J37/00; B01J8/00; B01J8/005; B01J8/006; B01J8/18; B01J8/1836; B01J8/1881; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00389; B01J2208/00407; B01J2208/00415; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD IN WHICH A CATALYST SUITABLE FOR USE IN THE PRODUCTION OF PHTHALIC ANHYDRIDE IS PRODUCED COMPRISING INTRODUCING SOLID PARTICLES OF A GLASS OF VANADIUM PENTOXIDE AND POTASSIUM PYROSULPHATE HAVING A MOLAR RATIO OF K2O:V2O5 BETWEEN 1.0 AND 6.0 INTO A FLUIDSIED BED OF PARTICLES OF SILICA GEL HAVING A PORE SIZE OF FROM 40 TO ABOUT 30A., SAID BED HAVING A TEMPERATURE BETWEEN 350 AND 400*C., SAID GLASS AMOUNTING TO FROM 1 TO 35% BY WEIGHT OF THE TOTAL MASS OF PARTICLES, AND SAID BED BEING MAINTAINED FLUIDSIED UNTIL THE GLASS MELTS AND IS TAKEN UP BY THE SILICA GEL.
Claim 2
Independent Claim
102 words
A METHOD IN WHICH A CATALYST SUITABLE FOR USE IN THE PRODUCTION OF PHTHALIC ANHYDRIDE IS PRODUCED COMPRISING INTRODUCING SOLID PARTICLES OF A GLASS OF VANADIUM PENTOXIDE AND POTASSIUM PYROSULPHATE HAVING A MOLAR RATIO OF K2O:V2O5 BETWEEN 1.0 AND 6.0 INTO A FLUIDSIED BED OF PARTICLES OF SILICA GEL HAVING A PORE SIZE OF FROM 40 TO ABOUT 30A., SAID BED HAVING A TEMPERATURE BETWEEN 350 AND 400*C., SAID GLASS AMOUNTING TO FROM 1 TO 35% BY WEIGHT OF THE TOTAL MASS OF PARTICLES, AND SAID BED BEING MAINTAINED FLUIDSIED UNTIL THE GLASS MELTS AND IS TAKEN UP BY THE SILICA GEL.
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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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |