Patent US2552278A successfully refreshed from Google Patents.
US2552278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid phase oxidation
Assignee: Monsanto Chemicals Ltd
•
Filing: 1949-03-22
•
Granted: 1951-05-08
•
Expires: 1969-03-22
Abstract
No abstract record available.
Inventors
- 👤 Carroll A Hochwalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:17
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE CATALYTIC LIQUID PHASE OXIDATION OF DIALKYLBENZENES TO DICARBOXYLIC ACIDS, 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 AT A TEMPERATURE IN EXCESS OF 140* C., IN THE PRESENCE OF TETRAALKYL LEAD.
Claim 2
Dependent Claim
64 words
THE CATALYTIC LIQUID PHASE OXIDATION OF DIALKYLBENZENES TO DICARBOXYLIC ACIDS, 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 AT A TEMPERATURE IN EXCESS OF 140* C., IN THE PRESENCE OF TETRAALKYL LEAD.
References Cited (Backward Citations)
DE364442C
Cited
US1939255A
Cited
US2120672A
Cited
US2215472A
Cited
US2245528A
Cited
US2276774A
Cited
US2479067A
Cited
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 |