Patent US2685558A successfully refreshed from Google Patents.
US2685558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of acidic oils
Assignee: Standard Oil Development Co
•
Filing: 1951-11-08
•
Granted: 1954-08-03
•
Expires: 1971-11-08
Abstract
No abstract record available.
Inventors
- 👤 Linnie P Hodges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:40
CPC Classifications
C; C10; C10G; C10G19/00; C10G71/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A METHOD FOR NEUTRALIZING A PETROLEUM LUBRICATING OIL WHICH HAS BEEN TREATED WITH SULFURIC ACID UNDER CONDITIONS TO FORM A HYDROCARBON LAYER AND AN ACID LAYER, WHICH COMPRISES SEPARATING A HYDROCARBON LAYER CONTAINING ACIDIC BODIES SELECTED FROM THE GROUP CONSISTING OF NAPHTHENIC, SULFONIC AND INORGANIC ACIDS FROM THE ACID LAYER, CONTACTING THE HYDROCARBON LAYER AT A TEMPERATURE IN THE RANGE BETWEEN 40* AND 210* F. AND AT A PRESSURE SUFFICIENT TO MAINTAIN A LIQUID PHASE WITH A TREATING REAGENT COMPRISING AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE, AN ALKALI METAL SALT OF AN INORGANIC ACID, AND AN ALKALI METAL SALT OF A PREFERENTIALLY WATER-SOLUBLE AROMATIC SULFONIC ACID, SAAID TREATING REAGENT HAVING A SPECIFIC GRAVITY NO LESS THAN 1.1 UNDER CONDITIONS TO REMOVE ACIDIC BODIES SELECTED FROM THE GROUP CONSISTING OF NAPHTHENIC, SOLFONIC AND INORGANIC ACIDS FROM SAID HYDROCARBON LAYER, SEPARATING THE TREATING REAGENT FROM SAID CONTACTED HYDROCARBON LAYER AND RECOVERING SAID CONTACTED HYDROCARBON LAYER SUBSTANTIALLY FREE OF SAID ACIDIC BODIES.
Claim 2
Independent Claim
161 words
A METHOD FOR NEUTRALIZING A PETROLEUM LUBRICATING OIL WHICH HAS BEEN TREATED WITH SULFURIC ACID UNDER CONDITIONS TO FORM A HYDROCARBON LAYER AND AN ACID LAYER, WHICH COMPRISES SEPARATING A HYDROCARBON LAYER CONTAINING ACIDIC BODIES SELECTED FROM THE GROUP CONSISTING OF NAPHTHENIC, SULFONIC AND INORGANIC ACIDS FROM THE ACID LAYER, CONTACTING THE HYDROCARBON LAYER AT A TEMPERATURE IN THE RANGE BETWEEN 40* AND 210* F. AND AT A PRESSURE SUFFICIENT TO MAINTAIN A LIQUID PHASE WITH A TREATING REAGENT COMPRISING AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE, AN ALKALI METAL SALT OF AN INORGANIC ACID, AND AN ALKALI METAL SALT OF A PREFERENTIALLY WATER-SOLUBLE AROMATIC SULFONIC ACID, SAAID TREATING REAGENT HAVING A SPECIFIC GRAVITY NO LESS THAN 1.1 UNDER CONDITIONS TO REMOVE ACIDIC BODIES SELECTED FROM THE GROUP CONSISTING OF NAPHTHENIC, SOLFONIC AND INORGANIC ACIDS FROM SAID HYDROCARBON LAYER, SEPARATING THE TREATING REAGENT FROM SAID CONTACTED HYDROCARBON LAYER AND RECOVERING SAID CONTACTED HYDROCARBON LAYER SUBSTANTIALLY FREE OF SAID ACIDIC BODIES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |