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US3296282A
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Oxidation of hydrocarbons
Assignee: Petro Tex Chemical Corp
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Filing: 1964-03-05
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Granted: 1967-01-03
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Expires: 1984-03-05
Abstract
No abstract record available.
Inventors
- 👤 Ralph O Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:25
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J27/195; B01J27/198; B01J27/28; B01J27/285; C07C51/252; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
THE PROCESS OF OXIDIZING A HYDROCARBON OF 4 TO 6 CARBON ATOMS TO MALEIC ANHYDRIDE WHICH COMPRISES CONTACTING A GASEOUS MIXTURE OF SAID HYDROCARBON AND OXYGEN AT AN ELEVATED TEMPERATURE IN CONTACT WITH A VANADIUM-PHOSPHORUS-OXYGEN CATALYST HAVING AN ATOMIC RATIO OF 1/2 TO 3 ATOMS OF PHOSPHORUS PER ATOM OF VANADIUM AND WHEREBY THE YIELD OF MALEIC ANHYDRIDE DIMINISHES WITH TIME, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE SAID CATALYST AN ORGANO-PHOSPHORUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF
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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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |