Patent US3226338A successfully refreshed from Google Patents.
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
•
Granted: 1965-12-28
•
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 23:36
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.
References Cited (Backward Citations)
US2716665A
Cited
US1930716A
Cited
US2459896A
Cited
US2489347A
Cited
US2625554A
Cited
US2861983A
Cited
US2846488A
Cited
US2977324A
Cited
US2973371A
Cited
US2952719A
Cited
US3038911A
Cited
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 |