Patent US3529443A successfully refreshed from Google Patents.
US2832801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonation of alkyl benzenes with sulfur trioxide
Assignee: Emulsol Chemical Corp
•
Filing: 1954-07-19
•
Granted: 1958-04-29
•
Expires: 1974-07-19
Abstract
No abstract record available.
Inventors
- 👤 Bernstein Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:50
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN THAT METHOD OF PREPARING ALKYL BENZENE SULFONATES IN WHICH THE ALKYL RADICAL CONTAINS AT LEAST 5 CARBON ATOMS AND WHEREIN SAID ALKYL BENZENE IS SULFONATED WITH SULPHUR TRIOXIDE CARRIED IN AN INERT MEDIUM, THE IMPROVEMENT WHICH COMPRISES HEATING THE REACTION PRODUCT, AFTER SUBSTANTIAL COMPLETION OF THE AFORESAIOD SULFONATION REACTION, TO BETWEEN ABOUT 105 AND ABOUT 145 DEGREES C.
Claim 2
Dependent Claim
59 words
IN THAT METHOD OF PREPARING ALKYL BENZENE SULFONATES IN WHICH THE ALKYL RADICAL CONTAINS AT LEAST 5 CARBON ATOMS AND WHEREIN SAID ALKYL BENZENE IS SULFONATED WITH SULPHUR TRIOXIDE CARRIED IN AN INERT MEDIUM, THE IMPROVEMENT WHICH COMPRISES HEATING THE REACTION PRODUCT, AFTER SUBSTANTIAL COMPLETION OF THE AFORESAIOD SULFONATION REACTION, TO BETWEEN ABOUT 105 AND ABOUT 145 DEGREES C.
References Cited (Backward Citations)
US1970556A
Cited
US2388677A
Cited
US2393526A
Cited
US2448184A
Cited
US2573675A
Cited
US2616936A
Cited
US2650198A
Cited
US2688633A
Cited
US2680716A
Cited
US2709685A
Cited
US2703788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-28 | 1961-10-28 | 1962-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-28 | 1965-10-28 | 1966-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-28 | 1969-10-28 | 1970-04-29 | $7700.00 | Window Closed / Lapsed |