US2773838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of maleic and alkyl substituted maleic anhydrides by catalytic oxidation
Assignee: Atlantic Richfield Co
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Filing: 1951-05-01
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Granted: 1956-12-11
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Expires: 1971-05-01
Abstract
No abstract record available.
Inventors
- 👤 John C Reid
- 👤 Norman C Sidebotham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:41
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C07C51/252
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
A METHOD OF PRODUCING DICARBOXYLIC ACID ANHYDRIDES SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE OR ALKYL SUBSTITUTED MALEIC ANHYDRIDES WITH COMPRISES REACTING THE VAPOR OF A NON-AROMATIC, UNSATURATED HYDROCARBON CONTAINING AT LEAST 4 CARBON ATOMS WITH A FREE OXYGEN-CONTAINING GAS AT A TEMPERATURE RANGING BETWEEN 800* F. TO 1000* F. IN THE PRESENCE OF A CATALYST PREPARED BY REACTING AMMONIUM META-VANADATE WITH PHOSPHORIC ACID IN AN AQUEOUS SOLUTION IN THE PRESENCE OF AN INERT CARRIER FOLLOWED BY REMOVAL OF THE SUPERNATANT LIQUID BY EVAPORATION, DRYING THE CALCINING, WHEREIN OXYGEN, VANADIUM, AND PHOSPHORUS ARE PRESENT IN A PROPORTION CORRESPONDING TO A WEIGHT RATIO OF V2O5 TO P2O5 WITHIN THE RANGE OF 3:2 AND 1:2.
Claim 2
Independent Claim
114 words
A METHOD OF PRODUCING DICARBOXYLIC ACID ANHYDRIDES SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE OR ALKYL SUBSTITUTED MALEIC ANHYDRIDES WITH COMPRISES REACTING THE VAPOR OF A NON-AROMATIC, UNSATURATED HYDROCARBON CONTAINING AT LEAST 4 CARBON ATOMS WITH A FREE OXYGEN-CONTAINING GAS AT A TEMPERATURE RANGING BETWEEN 800* F. TO 1000* F. IN THE PRESENCE OF A CATALYST PREPARED BY REACTING AMMONIUM META-VANADATE WITH PHOSPHORIC ACID IN AN AQUEOUS SOLUTION IN THE PRESENCE OF AN INERT CARRIER FOLLOWED BY REMOVAL OF THE SUPERNATANT LIQUID BY EVAPORATION, DRYING THE CALCINING, WHEREIN OXYGEN, VANADIUM, AND PHOSPHORUS ARE PRESENT IN A PROPORTION CORRESPONDING TO A WEIGHT RATIO OF V2O5 TO P2O5 WITHIN THE RANGE OF 3:2 AND 1:2.
Claim 3
Dependent Claim
69 words
A CATALYST FOR THE VAPOR PHASE PARTIAL OXIDATION OF NON-AROMATIC, UNSATURATED HYDROCARBONS PREPARED BY REACTING AMMONIUM META-VANADATE WITH PHOSPHORIC ACID IN AN AQUEOUS SOLUTION IN THE PRESENCE OF AN INERT CARRIER FOLLOWED BY REMOVAL OF THE SUPERNATANT LIQUID BY EVAPORATION, DRYING, AND CALCINING, WHEREIN OXYGEN, VANADIUM, AND PHOSPHORUS ARE PRESENT IN A PROPORTION CORRESPONDING TO A WEIGHT RATIO OF V2O5 TO P2O5 WITHIN THE RANGE OF 3:2 AND 1:2.
Claim 4
Dependent Claim
69 words
A CATALYST FOR THE VAPOR PHASE PARTIAL OXIDATION OF NON-AROMATIC, UNSATURATED HYDROCARBONS PREPARED BY REACTING AMMONIUM META-VANADATE WITH PHOSPHORIC ACID IN AN AQUEOUS SOLUTION IN THE PRESENCE OF AN INERT CARRIER FOLLOWED BY REMOVAL OF THE SUPERNATANT LIQUID BY EVAPORATION, DRYING, AND CALCINING, WHEREIN OXYGEN, VANADIUM, AND PHOSPHORUS ARE PRESENT IN A PROPORTION CORRESPONDING TO A WEIGHT RATIO OF V2O5 TO P2O5 WITHIN THE RANGE OF 3:2 AND 1:2.
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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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |