Patent US6077761A successfully refreshed from Google Patents.
US2806877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Di carboxylic aromatic compounds and process for making same
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-07-30
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Granted: 1957-09-17
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Expires: 1974-07-30
Abstract
No abstract record available.
Inventors
- 👤 Donald F Koenecke
- 👤 Louis A Mikeska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:35
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A PROCESS FOR PREPARING DIBASIC AROMATIC ACIDS FROM A DIALDEHYDE HAVING A BENZENE NUCLEUS CONTAINING ATTACHED THERETO TWO ALDEHYDE GROUPS -CHO AND UP TO FOUR ALKYL RADICALS OF 1 TO 20 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES MIXING SAID DIALDEHYDE WITH ONE TO TEN TIMES ITS WEIGHT OF AN AQUEOUS MEDIUM IMMISCIBLE THEREWITH, SAID MEDIUM BEING ADDED IN AN AMOUNT SUFFICIENT TO FORM A TWO-PHASE SYSTEM, ADDING AN ALKALI METAL PERMANGANATE IN AN AMOUNT SUFFICIENT TO OXIDIZE THE DIALDEHYDE TO THE DESIRED ACID, ALSO ADDING SUFFICIENT EXTRANEOUS ALKALI TO CONVERT ALL OF THE RESULTING ACID INTO ITS ALKALI METAL SOAP IN THE COURSE OF THE OXIDATION, MAINTAINING THE RESULTING TWO-PHASE MIXTURE UNDER REACTION CONDITIONS, AND SEPARATING THE DESIRED ACID FROM THE MIXTURE.
Claim 2
Dependent Claim
123 words
IN A PROCESS FOR PREPARING DIBASIC AROMATIC ACIDS FROM A DIALDEHYDE HAVING A BENZENE NUCLEUS CONTAINING ATTACHED THERETO TWO ALDEHYDE GROUPS -CHO AND UP TO FOUR ALKYL RADICALS OF 1 TO 20 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES MIXING SAID DIALDEHYDE WITH ONE TO TEN TIMES ITS WEIGHT OF AN AQUEOUS MEDIUM IMMISCIBLE THEREWITH, SAID MEDIUM BEING ADDED IN AN AMOUNT SUFFICIENT TO FORM A TWO-PHASE SYSTEM, ADDING AN ALKALI METAL PERMANGANATE IN AN AMOUNT SUFFICIENT TO OXIDIZE THE DIALDEHYDE TO THE DESIRED ACID, ALSO ADDING SUFFICIENT EXTRANEOUS ALKALI TO CONVERT ALL OF THE RESULTING ACID INTO ITS ALKALI METAL SOAP IN THE COURSE OF THE OXIDATION, MAINTAINING THE RESULTING TWO-PHASE MIXTURE UNDER REACTION CONDITIONS, AND SEPARATING THE DESIRED ACID FROM THE MIXTURE.
References Cited (Backward Citations)
US939940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |