US2831024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing dibasic carboxylic acids
Assignee: Gulf Research and Development Co
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Filing: 1955-04-04
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Granted: 1958-04-15
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Jr George P Brown
- 👤 Edgar I Crowley
- 👤 Norman W Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:31
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/316
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A PROCESS FOR OBTAINING DIBASIC CARBONYLIC ACIDS FROM A MIXTURE COMPRISING CYCLOALKANOLS AND CYCLOALKANONES HAVING ABOUT 4 TO ABOUT 9 CARBON ATOMS WHICH COMPRISES OXIDIZING SAID MIXTURE WITH NITRIC ACID HAVING A CONCENTRATION ABOVE ABOUT 40 PERCENT AT AN ELEVATED PRESSURE AND AN ELEVATED TEMPERATURE WHILE MAINTAINING UPON THE REACTANTS A PARTIAL PRESSURE OF MOLECULAR OXYGEN OF AT LEAST ABOUT TWO ATMOSPHERES.
Claim 2
Dependent Claim
62 words
A PROCESS FOR OBTAINING DIBASIC CARBONYLIC ACIDS FROM A MIXTURE COMPRISING CYCLOALKANOLS AND CYCLOALKANONES HAVING ABOUT 4 TO ABOUT 9 CARBON ATOMS WHICH COMPRISES OXIDIZING SAID MIXTURE WITH NITRIC ACID HAVING A CONCENTRATION ABOVE ABOUT 40 PERCENT AT AN ELEVATED PRESSURE AND AN ELEVATED TEMPERATURE WHILE MAINTAINING UPON THE REACTANTS A PARTIAL PRESSURE OF MOLECULAR OXYGEN OF AT LEAST ABOUT TWO ATMOSPHERES.
Claim 3
Dependent Claim
91 words
IN A PROCESS WHEREIN A CHARGE COMPRISING A CYCLOPARAFFIN HAVING ABOUT 4 TO ABOUT 9 CARBON ATOMS IN OXIDIZED IN A FIRST STAGE WITH AIR AND AT LEAST A PART OF SAID OXIDATION PRODUCT OBTAINED IS OXIDIZED IN A SECOND STAGE AT AN ELEVATED TEMPERATURE WITH NITRIC ACID HAVING A CONCENTRATION ABOVE ABOUT 40 PERCENT TO PRODUCE DIBASIC CARBOXYLIC ACIDS, THE IMPROVEMENT WHICH COMPRISES OXIDIZING IN THE SECOND STAGE WITH NITRIC ACID UNDER PRESSURE WHILE MAINTAINING UPON THE REACTANTS A PARTIAL PRESSURE OF MOLECULAR OXYGEN OF AT LEAST ABOUT TWO ATMOSPHERES.
Claim 4
Dependent Claim
91 words
IN A PROCESS WHEREIN A CHARGE COMPRISING A CYCLOPARAFFIN HAVING ABOUT 4 TO ABOUT 9 CARBON ATOMS IN OXIDIZED IN A FIRST STAGE WITH AIR AND AT LEAST A PART OF SAID OXIDATION PRODUCT OBTAINED IS OXIDIZED IN A SECOND STAGE AT AN ELEVATED TEMPERATURE WITH NITRIC ACID HAVING A CONCENTRATION ABOVE ABOUT 40 PERCENT TO PRODUCE DIBASIC CARBOXYLIC ACIDS, THE IMPROVEMENT WHICH COMPRISES OXIDIZING IN THE SECOND STAGE WITH NITRIC ACID UNDER PRESSURE WHILE MAINTAINING UPON THE REACTANTS A PARTIAL PRESSURE OF MOLECULAR OXYGEN OF AT LEAST ABOUT TWO ATMOSPHERES.
References Cited (Backward Citations)
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Cited
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US2223493A
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US2439513A
Cited
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US2703331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |