Patent US4958123A successfully refreshed from Google Patents.
Patent US2865957A successfully refreshed from Google Patents.
US2865957A
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Preparation of petroleum sulfonic acids and sulfonate derivatives thereof
Assignee: Phillips Petroleum Co
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Filing: 1955-11-25
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Granted: 1958-12-23
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Expires: 1975-11-25
Abstract
No abstract record available.
Inventors
- 👤 Richard S Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:54
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD FOR RECOVERING OIL-SOLUBLE PETROLEUM SULFONIC ACIDS FROM A SULFONATION MIXTURE PREPARED BY SUL FONATING A DEASPHALTED AND SOLVENT-REFINED PETROLEUM BRIGHT STOCK HAVING A CISCOSITY BETWEEN ABOUT 80 AND 700 SUS AT 210*F., WHICH METHOD COMPRISES TREATING THE SULFONATION MIXTURE WITH CONCENTRATED SULFURIC ACID, PERMITTING THE RESULTING ADMIXTURE TO STRATIFY THEREBY FORMING TWO IMMISCIBLE PHASE INCLUDING A TOP PHASE COMPRISING PETROLEUM SULFONIC ACIDS IN AN OIL SOLUTION AND A BOTTOM PHASE COMPRISING SPENT SULFURIC ACID, AND ISOLATING SAID TOP PHASE AS THE PRODUCT OF THE PROCESS.
Claim 2
Independent Claim
87 words
A METHOD FOR RECOVERING OIL-SOLUBLE PETROLEUM SULFONIC ACIDS FROM A SULFONATION MIXTURE PREPARED BY SUL FONATING A DEASPHALTED AND SOLVENT-REFINED PETROLEUM BRIGHT STOCK HAVING A CISCOSITY BETWEEN ABOUT 80 AND 700 SUS AT 210*F., WHICH METHOD COMPRISES TREATING THE SULFONATION MIXTURE WITH CONCENTRATED SULFURIC ACID, PERMITTING THE RESULTING ADMIXTURE TO STRATIFY THEREBY FORMING TWO IMMISCIBLE PHASE INCLUDING A TOP PHASE COMPRISING PETROLEUM SULFONIC ACIDS IN AN OIL SOLUTION AND A BOTTOM PHASE COMPRISING SPENT SULFURIC ACID, AND ISOLATING SAID TOP PHASE AS THE PRODUCT OF THE PROCESS.
References Cited (Backward Citations)
US2413311A
Cited
US2400298A
Cited
US2406763A
Cited
US2467179A
Cited
US2532997A
Cited
US2660562A
Cited
US2702819A
Cited
US2710303A
Cited
US2760970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |