US3180876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating complex acid mixtures
Assignee: Pure Oil Co
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Filing: 1962-07-13
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Granted: 1965-04-27
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Expires: 1982-07-13
Abstract
No abstract record available.
Inventors
- 👤 Louis A Joo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:30
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
THE METHOD OF SEPARATING MIXTURES OF CARBOXYLIC ACIDS PRODUCED BY THE METALATION, CARBONATION AND ACIDIFICATION OF SOLVENT EXTRACTS OBTAINED IN THE SOLVENT EXTRACTION OF MINERAL LUBRICATION OILS WHICH CONSISTS IN DISSOLVING SAID ACID MIXTURE IN A SUFFICIENT AMOUNT OF TOLUENE TO FORM AN ACID CONCENTRATION OF ABOUT 10 TO 40% BY WEIGHT, ADDING ADDITIONAL PORTIONS OF TOLUENE TO SAID SOLUTION TO PRECIPITATE A FIRST FRACTION OF ACIDS, SEPARATING SAID FIRST FRACTION OF PRECIPITATED ACIDS FROM THE FILTRATE AND ADDING ADDITIONAL PORTIONS OF TOLUENE TO SAID FILTRATE TO FORM AND SEPARATE SUBSEQUENT ACID FRACTIONS, EACH OF SAID ADDITIONAL PORTIONS OF TOLUENE HAVING A VOLUME AT LEAST EQUAL TO THE VOLUME OF SAID ACID SOLUTION TO A VOLUME FIVE TIMES AS GREAT AS THE VOLUME OF SAID ACID SOLUTION, SAID ACID FRACTIONS BEING CHARACTERIZED BY GREATER ACIDITY, HIGHER MOLECULAR WEIGHT AND CONTAINING A HIGHER NUMBER OF CARBOXYLIC GROUPS PER MOLECULE THAN THE AVERAGE ACIDITY, MOLECULAR WEIGHT OR NUMBER OF CARBOXYLIC GROUPS PER MOLECULE OF SAID MIXTURE.
Claim 2
Independent Claim
164 words
THE METHOD OF SEPARATING MIXTURES OF CARBOXYLIC ACIDS PRODUCED BY THE METALATION, CARBONATION AND ACIDIFICATION OF SOLVENT EXTRACTS OBTAINED IN THE SOLVENT EXTRACTION OF MINERAL LUBRICATION OILS WHICH CONSISTS IN DISSOLVING SAID ACID MIXTURE IN A SUFFICIENT AMOUNT OF TOLUENE TO FORM AN ACID CONCENTRATION OF ABOUT 10 TO 40% BY WEIGHT, ADDING ADDITIONAL PORTIONS OF TOLUENE TO SAID SOLUTION TO PRECIPITATE A FIRST FRACTION OF ACIDS, SEPARATING SAID FIRST FRACTION OF PRECIPITATED ACIDS FROM THE FILTRATE AND ADDING ADDITIONAL PORTIONS OF TOLUENE TO SAID FILTRATE TO FORM AND SEPARATE SUBSEQUENT ACID FRACTIONS, EACH OF SAID ADDITIONAL PORTIONS OF TOLUENE HAVING A VOLUME AT LEAST EQUAL TO THE VOLUME OF SAID ACID SOLUTION TO A VOLUME FIVE TIMES AS GREAT AS THE VOLUME OF SAID ACID SOLUTION, SAID ACID FRACTIONS BEING CHARACTERIZED BY GREATER ACIDITY, HIGHER MOLECULAR WEIGHT AND CONTAINING A HIGHER NUMBER OF CARBOXYLIC GROUPS PER MOLECULE THAN THE AVERAGE ACIDITY, MOLECULAR WEIGHT OR NUMBER OF CARBOXYLIC GROUPS PER MOLECULE OF SAID MIXTURE.
References Cited (Backward Citations)
US2840604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |