Patent US2807642A successfully refreshed from Google Patents.
US2807642A
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Method of sulfonation to produce inorganic salt-free product
Assignee: Universal Oil Products Co
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Filing: 1954-12-31
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Granted: 1957-09-24
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Expires: 1974-12-31
Abstract
No abstract record available.
Inventors
- 👤 Herman S Bloch
- 👤 Howard E Mammen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:34
CPC Classifications
C; C07; C07C; C07C309/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE SULFONATION OF A SULFONATABLE ORGANIC COMPOUND WITH AN EXCESS OF SULFUR TRIOXIDE, THE PROCESS OF SEPARATING THE EXCESS SULFUR TRIOXIDE FROM THE SULFONATION REACTION MIXTURE WHICH COMPRISES INTRODUCING AN INERT LIQUID DILUENT TO THE REACTION MIXTURE PRIOR TO THE SEPARATION OF THE SULFONATED PRODUCT THEREFROM, ADDING TO THE DILUENT-CONTAINING REACTION MIXTURE, UPON COMPLETION OF THE SULFONATION REACTION, AN ORGANIC AMIDE IN AN AMOUNT SUFFICIENT TO REACT WITH SAID EXCESS SULFUR TRIOXIDE AND FORM AN ADDITION PRODUCT THEREWITH, SAID INERT DILUENT BEING AN ORGANIC LIQUID IN WHICH THE AMIDE-SO3 ADDITION PRODUCT IS INSOLUBLE, WHEREBY SAID ADDITION PRODUCT IS PRECIPITATED, AND SEPARATING THE RESULTANT PRECIPITATE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
109 words
IN THE SULFONATION OF A SULFONATABLE ORGANIC COMPOUND WITH AN EXCESS OF SULFUR TRIOXIDE, THE PROCESS OF SEPARATING THE EXCESS SULFUR TRIOXIDE FROM THE SULFONATION REACTION MIXTURE WHICH COMPRISES INTRODUCING AN INERT LIQUID DILUENT TO THE REACTION MIXTURE PRIOR TO THE SEPARATION OF THE SULFONATED PRODUCT THEREFROM, ADDING TO THE DILUENT-CONTAINING REACTION MIXTURE, UPON COMPLETION OF THE SULFONATION REACTION, AN ORGANIC AMIDE IN AN AMOUNT SUFFICIENT TO REACT WITH SAID EXCESS SULFUR TRIOXIDE AND FORM AN ADDITION PRODUCT THEREWITH, SAID INERT DILUENT BEING AN ORGANIC LIQUID IN WHICH THE AMIDE-SO3 ADDITION PRODUCT IS INSOLUBLE, WHEREBY SAID ADDITION PRODUCT IS PRECIPITATED, AND SEPARATING THE RESULTANT PRECIPITATE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2514733A
Cited
US2573675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |