Patent US2782230A successfully refreshed from Google Patents.
US2782230A
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Sulfonation with sulfur trioxide
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-04-06
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Granted: 1957-02-19
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Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 William H Seaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:59
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C309/00; C07C309/01; C07C309/28; C07C309/29; C07C309/30; C07C309/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS OF PRODUCING A SUBSTANTIALLY INORGANIC SALT-FREE ORGANIC SULFONATE SURFACE ACTIVE AGENT BY SULFONATION OF AN ALKYLATED AROMATIC HYDROCARBON CONTAINING AT LEAST 10 CARBON ATOMS IN THE SIDE CHAIN WITH SULFUR TRIOXIDE AND NEUTRALIZING THE SULFONIC ACID SO PRODUCED, THE STEPS OF ADDING A MATERIAL OF THE GROUP CONSISTING OF ELEMENTAL MERCURY AND MERCURY SALTS TO THE CRUDE SULFONATION MASS AFTER COMPLETING THE SULFONATION REACTION WITHOUT A CATALYST BUT BEFORE NEUTRALIZATION OF THE SULFONIC ACID IS COMPLETE, HEATING AND STIRRING THE MIXTURE, AND NEUTRALIZING THE SULFONATED MATERIAL.
Claim 2
Dependent Claim
89 words
IN A PROCESS OF PRODUCING A SUBSTANTIALLY INORGANIC SALT-FREE ORGANIC SULFONATE SURFACE ACTIVE AGENT BY SULFONATION OF AN ALKYLATED AROMATIC HYDROCARBON CONTAINING AT LEAST 10 CARBON ATOMS IN THE SIDE CHAIN WITH SULFUR TRIOXIDE AND NEUTRALIZING THE SULFONIC ACID SO PRODUCED, THE STEPS OF ADDING A MATERIAL OF THE GROUP CONSISTING OF ELEMENTAL MERCURY AND MERCURY SALTS TO THE CRUDE SULFONATION MASS AFTER COMPLETING THE SULFONATION REACTION WITHOUT A CATALYST BUT BEFORE NEUTRALIZATION OF THE SULFONIC ACID IS COMPLETE, HEATING AND STIRRING THE MIXTURE, AND NEUTRALIZING THE SULFONATED MATERIAL.
References Cited (Backward Citations)
US2493038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |