US2729665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dicarboxylic acids and their derivatives and production of the same from paraffin wax
Assignee: Union Oil Company of California
•
Filing: 1952-03-17
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Granted: 1956-01-03
•
Expires: 1972-03-17
Abstract
No abstract record available.
Inventors
- 👤 John P Buckmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:37
CPC Classifications
C; C07; C07C; C07C55/00; C07C55/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
A METHOD FOR THE TREATMENT OF PARAFFIN WAX TO PRODUCE A MIXTURE OF DICARBOXYLIC ACIDS WHICH COMPRISES OXIDIZING A REFINED PARAFFIN WAX, HAVING BETWEEN ABOUT 15 AND ABOUT 50 CARBON ATOMS PER MOLECULE AND A MELTING POINT BETWEEN ABOUT 90* F. AND ABOUT 200* F. BY BLOWING SAID WAX WITH A GAS CONTAINING FREE OXYGEN AT A PRESSURE BETWEEN NORMAL ATMOSPHERIC PRESSURE AND 500 POUNDS PER SQUARE INCH GAGE AND A TEMPERATURE BETWEEN ABOUT 210* F. AND ABOUT 260* F. UNTIL THE OXIDIZED PRODUCT HAS AN ACID NUMBER BETWEEN ABOUT 490 AND ABOUT 575 MG. KOH/G., THE RATE OF SAID BLOWING BEING INITIALLY BETWEEN 0.75 AND 1.25 STANDARD CUBIC FEET PER MINUTE PER 100 POUNDS OF WAX AND BEING INCREASED TO BETWEEN 1.5 AND 2.0 STANDARD CUBIC FEET AT THE END OF THE PERIOD OF OXIDATION.
Claim 2
Independent Claim
136 words
A METHOD FOR THE TREATMENT OF PARAFFIN WAX TO PRODUCE A MIXTURE OF DICARBOXYLIC ACIDS WHICH COMPRISES OXIDIZING A REFINED PARAFFIN WAX, HAVING BETWEEN ABOUT 15 AND ABOUT 50 CARBON ATOMS PER MOLECULE AND A MELTING POINT BETWEEN ABOUT 90* F. AND ABOUT 200* F. BY BLOWING SAID WAX WITH A GAS CONTAINING FREE OXYGEN AT A PRESSURE BETWEEN NORMAL ATMOSPHERIC PRESSURE AND 500 POUNDS PER SQUARE INCH GAGE AND A TEMPERATURE BETWEEN ABOUT 210* F. AND ABOUT 260* F. UNTIL THE OXIDIZED PRODUCT HAS AN ACID NUMBER BETWEEN ABOUT 490 AND ABOUT 575 MG. KOH/G., THE RATE OF SAID BLOWING BEING INITIALLY BETWEEN 0.75 AND 1.25 STANDARD CUBIC FEET PER MINUTE PER 100 POUNDS OF WAX AND BEING INCREASED TO BETWEEN 1.5 AND 2.0 STANDARD CUBIC FEET AT THE END OF THE PERIOD OF OXIDATION.
Claim 3
Dependent Claim
26 words
A METHOD ACCORDING TO CLAIM 1 IN WHICH SAID PRODUCED MIXTURE OF DICARBOXYLIC ACIDS IS ESTERIFIED WITH A SATURATED ALIPHATIC ALCOHOL TO PRODUCE THE CORRESPONDING ESTER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |