Patent US4843282A successfully refreshed from Google Patents.
Patent US3133946A successfully refreshed from Google Patents.
US3133946A
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Preparation of long chain alkylsulfuric acids and salts thereof
Assignee: Individual
•
Filing: 1960-04-08
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Granted: 1964-05-19
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Expires: 1980-04-08
Abstract
No abstract record available.
Inventors
- 👤 Elmer W Maurer
- 👤 Alexander J Stirton
- 👤 James K Weil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:55
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/24; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR PREPARING A SUBSTANTIALLY PURE ALKYLSULFURIC ACID COMPRISING REACTING CHLOROSULFONIC ACID WITH AN N-ALKANOL OF THE FORMULA ROH WHEREIN R IS AN N-ALKYL GROUP HAVING 12 TO 22 CARBON ATOMS, SAID N-ALKANOL BEING IN SOLUTION IN A LOW-BOILING HALOGENATED HYDROCARBON INERT WITH RESPECT TO THE CHLOROSULFONIC ACID, AT A TEMPERATURE BELOW ABOUT 30*C. TO CONVERT THE ALKANOL TO AN ALKYLSULFURIC ACID OF THE FORMULA
Claim 2
Dependent Claim
66 words
A PROCESS FOR PREPARING A SUBSTANTIALLY PURE ALKYLSULFURIC ACID COMPRISING REACTING CHLOROSULFONIC ACID WITH AN N-ALKANOL OF THE FORMULA ROH WHEREIN R IS AN N-ALKYL GROUP HAVING 12 TO 22 CARBON ATOMS, SAID N-ALKANOL BEING IN SOLUTION IN A LOW-BOILING HALOGENATED HYDROCARBON INERT WITH RESPECT TO THE CHLOROSULFONIC ACID, AT A TEMPERATURE BELOW ABOUT 30*C. TO CONVERT THE ALKANOL TO AN ALKYLSULFURIC ACID OF THE FORMULA
References Cited (Backward Citations)
US2056272A
Cited
US2075915A
Cited
US2012610A
Cited
US2052716A
Cited
US2062454A
Cited
US2256877A
Cited
US2577218A
Cited
US2634287A
Cited
US2597708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |