US2865957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 18:23
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.
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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 |