US2581139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the quality
Assignee: —
•
Filing: —
•
Granted: 1952-01-01
•
Expires: 1969-01-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:55
CPC Classifications
C; C10; C10G; C10G19/00; C10G19/02; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C10G17/00; C10G17/02; C10G17/04; C10G2300/00; C10G2300/20; C10G2300/201; C10G2300/202; C10G2300/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE PROCESS FOR SEPARATING NAPTHENIC ACIDS FREE OF REACTIVE SULFUR WHICH COMPRISES WASHING AN UNTREATED PETROLEUM GAS OIL DISTILLATE FRACTION CONTAINING NAPHTHENIC ACIDS WITH AN AQUEOUS MEDIA THAT HAS A PH ABOUT THAT OF SEA WATER AND NO GREATER THAN 9.8, CONTACTING THE WASHED PETROLEUM OIL WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE, SEPARATING THE AQUEOUS SOLUTION FROM THE PETROLEUM OIL, ACIDIFYING THE SEPARATED AQUEOUS SOLUTION, SEPARATING NAPHTHENIC ACIDS FROM THE ACIDIFIED AQUEOUS SOLUTION, AND WASHING THE SEPARATED NAPHTHENIC ACIDS WITH WATER.
Claim 2
Dependent Claim
84 words
THE PROCESS FOR SEPARATING NAPTHENIC ACIDS FREE OF REACTIVE SULFUR WHICH COMPRISES WASHING AN UNTREATED PETROLEUM GAS OIL DISTILLATE FRACTION CONTAINING NAPHTHENIC ACIDS WITH AN AQUEOUS MEDIA THAT HAS A PH ABOUT THAT OF SEA WATER AND NO GREATER THAN 9.8, CONTACTING THE WASHED PETROLEUM OIL WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE, SEPARATING THE AQUEOUS SOLUTION FROM THE PETROLEUM OIL, ACIDIFYING THE SEPARATED AQUEOUS SOLUTION, SEPARATING NAPHTHENIC ACIDS FROM THE ACIDIFIED AQUEOUS SOLUTION, AND WASHING THE SEPARATED NAPHTHENIC ACIDS WITH WATER.
References Cited (Backward Citations)
US1969694A
Cited
US1953336A
Cited
US2146353A
Cited
US2131938A
Cited
US2170506A
Cited
US2220138A
Cited
US2288281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |