US3832359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of maleic anhydride by catalytic oxidation of saturated aliphatic hydrocarbons
Assignee: Monsanto Co
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Filing: 1971-10-06
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Granted: 1974-08-27
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Expires: 1991-10-06
Abstract
Abstract MALEIC ANHYDRIDE IS PRODUCED BY THE CATALYTIC VAPOR PHASE OXIDATION OF A SATURATED ALIPHATIC HYDROCARBON, E.G., N-BUTANE, IN THE PRESENCE OF A CATALYST COMPRISING PHOSPHORUS, VANADIUM, IRON AND OXYGEN.
Inventors
- 👤 M Freerks
- 👤 M Suda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:35
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |