US3074969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing maleic anhydride
Assignee: PPG Industries Inc
•
Filing: 1959-05-12
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Granted: 1963-01-22
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Expires: 1979-05-12
Abstract
No abstract record available.
Inventors
- 👤 Ralph O Kerr
- 👤 Wayne R Decker
- 👤 Charles M Dorsett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:51
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD OF PREPARING MALIC ANHYDRIDE COMPRISING REACTING BENZENE AND OXYGEN IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF AN OXIDE MIXTURE OF V2O5, MOO3, CO2O3, AND AN ALKALI METAL CHLORIDE OF THE GROUP CONSISTING OF NACL AND KCL IMPREGNATED ON AN INERT CARRIER, THE MOLE RATIO OF VANADUM TO MOLYBDENUM TO COBALT TO THE ALKALI METAL BEING 1 TO .258 TO .090 TO .0017.
Claim 2
Independent Claim
66 words
A METHOD OF PREPARING MALIC ANHYDRIDE COMPRISING REACTING BENZENE AND OXYGEN IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF AN OXIDE MIXTURE OF V2O5, MOO3, CO2O3, AND AN ALKALI METAL CHLORIDE OF THE GROUP CONSISTING OF NACL AND KCL IMPREGNATED ON AN INERT CARRIER, THE MOLE RATIO OF VANADUM TO MOLYBDENUM TO COBALT TO THE ALKALI METAL BEING 1 TO .258 TO .090 TO .0017.
References Cited (Backward Citations)
US2734874A
Cited
GB659786A
Cited
US2625519A
Cited
US2719853A
Cited
US2739132A
Cited
US2777860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |