US3156705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dicarboxylic acid anhydrides by the catalytic oxidation of olefins
Assignee: Petro Tex Chemical Corp
•
Filing: 1960-12-14
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Granted: 1964-11-10
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Expires: 1980-12-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph O Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:29
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; B; B01; B01J; B01J21/00; B01J21/02; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/24; C07C51/215; C07C51/252; C10; C10B; C10B57/00; C10B57/04; C10B57/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A PROCESS FORTHE VAPOR PHASE CATALYTIC OXIDATION OF BUTENE TO PROVIDE MALEIC ANHYDRIDE, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID CATGALYTIC OXIDATION IN THE PRESENCE OF A CATALYST COMPLEX COMPRISING VANADIUM, OXYGEN, PHOSPHORUS AND A METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF THE FOURTH PERIOD OF GROUP VIIIB AND MIXTURES THEREOF, SAID CATALYST CONTAINING FROM ABOUT 1.1 TO ABOUT 1.6 ATOMS OF PHOSPHORUS PER ATOM OF VANADIUM AND CONTAINING FROM ABOUT 0.20 TO ABOUT 2.0 WEIGHT PERCENT OF THE SAID METALS OF THE FOURTH PERIOD OF GROUP VIIIB BASED ON THE TOTAL WEIGHT OF VANADIUM, OXYGEN AND PHOSPHORUS; THE SAID CATALYST HAVING BEEN DEPOSITED ONTO CARRIER PARTICLES WHILE THE VANADIUM HAS AN AVERAGE VALENCE OF NO MORE THAN PLUS 4.6.
Claim 2
Dependent Claim
123 words
IN A PROCESS FORTHE VAPOR PHASE CATALYTIC OXIDATION OF BUTENE TO PROVIDE MALEIC ANHYDRIDE, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID CATGALYTIC OXIDATION IN THE PRESENCE OF A CATALYST COMPLEX COMPRISING VANADIUM, OXYGEN, PHOSPHORUS AND A METAL SELECTED FROM THE GROUP CONSISTING OF THE METALS OF THE FOURTH PERIOD OF GROUP VIIIB AND MIXTURES THEREOF, SAID CATALYST CONTAINING FROM ABOUT 1.1 TO ABOUT 1.6 ATOMS OF PHOSPHORUS PER ATOM OF VANADIUM AND CONTAINING FROM ABOUT 0.20 TO ABOUT 2.0 WEIGHT PERCENT OF THE SAID METALS OF THE FOURTH PERIOD OF GROUP VIIIB BASED ON THE TOTAL WEIGHT OF VANADIUM, OXYGEN AND PHOSPHORUS; THE SAID CATALYST HAVING BEEN DEPOSITED ONTO CARRIER PARTICLES WHILE THE VANADIUM HAS AN AVERAGE VALENCE OF NO MORE THAN PLUS 4.6.
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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) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |