US3684741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supported catalysts containing vanadium pentoxide and titanium dioxide and their use for the production of carboxylic acids and carboxylic anhydrides
Assignee: BASF SE
•
Filing: 1969-08-12
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Granted: 1972-08-15
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Expires: 1989-08-12
Abstract
Abstract SUPPORTED CATALYSTS FOR THE OXIDATION OF AROMATIC OR UNSATURATED ALIPHATIC HYDROCARBONS TO CARBOXYLIC ACIDS OR ANHYDRIDES, CONSISTING OF AN INERT NONPOROUS CARRIER AND AN ACTIVE COMPOSITION OF 1 TO 40 PARTS BY WEIGHT OF VANADIUM PENTOXIDE AND 60 TO 90 PARTS BY WEIGHT OF TITANIUM DIOXIDE AND ALSO 0.01 TO 10% BY WEIGHT (WITH REFERENCE TO THE AMOUNT OF VANADIUM PENTOXIDE) OF A PHOSPHOROUS COMPOUND, THE VANADIUM PENTOXIDE CONTENT OF THE WHOLE SUPPORTED CATALYST BEING 0.05 TO 3% BY WEIGHT. THE CATALYSTS ARE USED ESPECIALLY FOR THE PRODUCTION OF PHTHALIC ANHYDRIDE FROM O-XYLENE.
Inventors
- 👤 Wilhelm Friedrichsen
- 👤 Otto Goehre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:06
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C07C51/21; C07C51/25; C07C51/252; C07C51/255; C07C51/265
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |