US2530757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of sulfuric acid sludge
Assignee: Standard Oil Co
•
Filing: 1945-12-04
•
Granted: 1950-11-21
•
Expires: 1965-12-04
Abstract
No abstract record available.
Inventors
- 👤 David W Bransky
- 👤 Norman E Lemmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:11
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE METHOD OF RECOVERING INTERMEDIATE WATER-SOLUBLE SULFONIC ACIDS FROM UNHYDROLYZED SULFURIC ACID SLUDGE CONTAINING WATER-SOLUBLE BLACK SULFONIC ACIDS, INTERMEDIATE WATER-SOLUBLE DETERGENT-TYPE SULFONIC ACIDS AND PREFERENTIALLY OILSOLUBLE SULFONIC ACIDS, RESULTING FROM THE TREATMENT OF HYDROCARBON OILS WITH STRONG SULFURIC ACID, COMPRISING EXTRACTING SAID ACID SLUDGE WITH A CHLORINATED HYDROCARBON SOLVENT, IN THE ABSENCE OF ADDED WATER, SEPARATING THE CHLORINATED HYDROCARBON EXTRACT CONTAINING INTERMEDIATE WATER-SOLUBLE DETERGENT-TYPE SULFONIC ACIDS AND PREFERENTIALLY OIL-SOLUBLE SULFONIC ACIDS, FROM THE ACID SLUDGE, AND EXTRACTING PREFERENTILLY OILSOLUBLE SULFONIC ACIDS FROM THE CHLORINATED HYDROCARBON EXTRACT WITH A PREDOMINANTLY ALIPHATIC HYDROCARBON SOLVENT.
Claim 2
Independent Claim
92 words
THE METHOD OF RECOVERING INTERMEDIATE WATER-SOLUBLE SULFONIC ACIDS FROM UNHYDROLYZED SULFURIC ACID SLUDGE CONTAINING WATER-SOLUBLE BLACK SULFONIC ACIDS, INTERMEDIATE WATER-SOLUBLE DETERGENT-TYPE SULFONIC ACIDS AND PREFERENTIALLY OILSOLUBLE SULFONIC ACIDS, RESULTING FROM THE TREATMENT OF HYDROCARBON OILS WITH STRONG SULFURIC ACID, COMPRISING EXTRACTING SAID ACID SLUDGE WITH A CHLORINATED HYDROCARBON SOLVENT, IN THE ABSENCE OF ADDED WATER, SEPARATING THE CHLORINATED HYDROCARBON EXTRACT CONTAINING INTERMEDIATE WATER-SOLUBLE DETERGENT-TYPE SULFONIC ACIDS AND PREFERENTIALLY OIL-SOLUBLE SULFONIC ACIDS, FROM THE ACID SLUDGE, AND EXTRACTING PREFERENTILLY OILSOLUBLE SULFONIC ACIDS FROM THE CHLORINATED HYDROCARBON EXTRACT WITH A PREDOMINANTLY ALIPHATIC HYDROCARBON SOLVENT.
References Cited (Backward Citations)
DE271433C
Cited
US1319027A
Cited
US1087888A
Cited
AT85326B
Cited
US1474933A
Cited
US1409590A
Cited
FR773656A
Cited
US2263041A
Cited
US2223194A
Cited
US2328931A
Cited
US2320738A
Cited
US2368452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |