Patent US2940936A successfully refreshed from Google Patents.
US2940936A
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Preparing sulfonated products from sulfur trioxide
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-04-07
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Granted: 1960-06-14
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Expires: 1973-04-07
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Fike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:16
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A PROCESS OF SULFONATING AN ALKYLATED AROMATIC HYDROCARBON CONTAINING AT LEAST TEN CARBON ATOMS IN THE SIDE CHAIN WITH GASEOUS SULFUR TRIOXIDE UNDER ANHYDROUS CONDITIONS AND NEUTRALIZING THE SULFONIC ACID SO OBTAINED TO PRODUCE A SULFONATE SUBSTANTIALLY FREE OF SULFATE FROM THE BASE EMPLOYED FOR THE NEUTRALIZATION, THE STEPS WHICH COMPRISE ADDING A PRIMARY ALCOHOL TO THE CRUDE SULFONATED MASS FREE FROM UNCOMBINED SULFUR TRIOXIDE BEFORE NEUTRALIZATION OF THE SULFONIC ACID IS COMPLETE, THE SAID ALCOHOL BEING IN MINOR AMOUNT NOT MORE THAN TWICE BUT AT LEAST EQUIVALENT TO THE SODIUM SULFATE CONTENT WHEN NEUTRALIZED WITH SODIUM HYDROXIDE AND COMPLETING THE NEUTRALIZATION IN THE PRESENCE OF THE ADDED ALCOHOL.
Claim 2
Dependent Claim
110 words
IN A PROCESS OF SULFONATING AN ALKYLATED AROMATIC HYDROCARBON CONTAINING AT LEAST TEN CARBON ATOMS IN THE SIDE CHAIN WITH GASEOUS SULFUR TRIOXIDE UNDER ANHYDROUS CONDITIONS AND NEUTRALIZING THE SULFONIC ACID SO OBTAINED TO PRODUCE A SULFONATE SUBSTANTIALLY FREE OF SULFATE FROM THE BASE EMPLOYED FOR THE NEUTRALIZATION, THE STEPS WHICH COMPRISE ADDING A PRIMARY ALCOHOL TO THE CRUDE SULFONATED MASS FREE FROM UNCOMBINED SULFUR TRIOXIDE BEFORE NEUTRALIZATION OF THE SULFONIC ACID IS COMPLETE, THE SAID ALCOHOL BEING IN MINOR AMOUNT NOT MORE THAN TWICE BUT AT LEAST EQUIVALENT TO THE SODIUM SULFATE CONTENT WHEN NEUTRALIZED WITH SODIUM HYDROXIDE AND COMPLETING THE NEUTRALIZATION IN THE PRESENCE OF THE ADDED ALCOHOL.
References Cited (Backward Citations)
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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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |