Patent US2552268A successfully refreshed from Google Patents.
US2552268A
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Liquid phase oxidation
Assignee: Monsanto Chemicals Ltd
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Filing: 1949-03-22
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Granted: 1951-05-08
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Expires: 1969-03-22
Abstract
No abstract record available.
Inventors
- 👤 William S Emerson
- 👤 Robert A Heimsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
THE CATALYTIC LIQUID PHASE OXIDATION OF DIALKYLBENZENE TO DICARBOXYLIC ACID, WHICH COMPRISES CONTACTING A DIALKYLBENZENE HAVING FROM ONE TO FOUR CARBON ATOMS IN THE ALKYL GROUPS, WITH AN OXYGEN CONTAINING GAS IN THE PRESENCE OF AN OXIDATION CATALYST OF THE GROUP CONSISTING OF METAL OXIDES, METAL SALTS, AND MIXTURES THEREOF AND HEXACHLORETHANE, AT A TEMPERATURE IN EXCESS OF 140* C.
Claim 2
Dependent Claim
60 words
THE CATALYTIC LIQUID PHASE OXIDATION OF DIALKYLBENZENE TO DICARBOXYLIC ACID, WHICH COMPRISES CONTACTING A DIALKYLBENZENE HAVING FROM ONE TO FOUR CARBON ATOMS IN THE ALKYL GROUPS, WITH AN OXYGEN CONTAINING GAS IN THE PRESENCE OF AN OXIDATION CATALYST OF THE GROUP CONSISTING OF METAL OXIDES, METAL SALTS, AND MIXTURES THEREOF AND HEXACHLORETHANE, AT A TEMPERATURE IN EXCESS OF 140* C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |