US2813119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon oxidation
Assignee: Hercules Powder Co
•
Filing: 1954-05-07
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Granted: 1957-11-12
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Expires: 1974-05-07
Abstract
No abstract record available.
Inventors
- 👤 Milton A Taves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:26
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN THE OXIDATION OF A METHYLATED BENZENE HAVING NOT MORE THAN TWO METHYL GROUPS TO AN AROMATIC CARBOXYLIC ACID WHEREIN SAID METHYLATED BENZENE IS OXIDIZED IN THE LIQUID PHASE IN THE PRESENCE OF AN OXIDATION CATALYST COMPRISING A SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF COBALT, MANGANESE, IRON, AND MERCURY WITH AN OXYGEN-CONTAINING GAS AT A TEMPERATURE FROM 80-250*C. AND AT A PRESSURE OF FROM 15-400 P.S.I. BUT BELOW THAT AT WHICH SUFFICIENT WATER IS RETAINED IN THE OXIDATE TO COMPLETELY HYDROLYZE ESTERS FORMED DURING THE OXIDATION, THE IMPROVEMENT WHICH COMPRISES PERIODICALLY DETERMINING THE ESTER NUMBER OF THE OXIDATE AND TERMINATING THE OXIDATION WHEN THE ESTER NUMBER HAS REACHED A MAXIMUM LEVEL AND THEN DECREASED TO A LEVEL SUBSTANTIALLY BELOW SAID MAXIMUM.
Claim 2
Dependent Claim
125 words
IN THE OXIDATION OF A METHYLATED BENZENE HAVING NOT MORE THAN TWO METHYL GROUPS TO AN AROMATIC CARBOXYLIC ACID WHEREIN SAID METHYLATED BENZENE IS OXIDIZED IN THE LIQUID PHASE IN THE PRESENCE OF AN OXIDATION CATALYST COMPRISING A SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF COBALT, MANGANESE, IRON, AND MERCURY WITH AN OXYGEN-CONTAINING GAS AT A TEMPERATURE FROM 80-250*C. AND AT A PRESSURE OF FROM 15-400 P.S.I. BUT BELOW THAT AT WHICH SUFFICIENT WATER IS RETAINED IN THE OXIDATE TO COMPLETELY HYDROLYZE ESTERS FORMED DURING THE OXIDATION, THE IMPROVEMENT WHICH COMPRISES PERIODICALLY DETERMINING THE ESTER NUMBER OF THE OXIDATE AND TERMINATING THE OXIDATION WHEN THE ESTER NUMBER HAS REACHED A MAXIMUM LEVEL AND THEN DECREASED TO A LEVEL SUBSTANTIALLY BELOW SAID MAXIMUM.
References Cited (Backward Citations)
US2245528A
Cited
US2696499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |