Patent US1325402A successfully refreshed from Google Patents.
Patent US2693487A successfully refreshed from Google Patents.
US2693487A
Expired / Lapsed
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Monosulfonation of benzene
Assignee: Monsanto Chemicals Ltd
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Filing: 1948-01-30
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Granted: 1954-11-02
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Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 Robert D Swisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:12
CPC Classifications
C; C07; C07C; C07C309/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A METHOD OF PREPARING BENZENE MONOSULFONIC ACID WHICH COMPRISES REACTING BENZENE AND SO3 IN THE FORM OF A 60 TO 100% OLEUM IN ABOUT EQUAL MOLECULE PROPORTIONS IN THE PRESENCE OF FROM ABOUT 0.03 TO 0.2 MOL PER MOL OF BENZENE OF A MATERIALSELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SULFATES, ALKALI-EARTH METAL SULFATES, ALKALI METAL BENXZENE SULFONATES AND ALKALI-EARTH METAL BENZENE SULFONATES.
Claim 2
Independent Claim
64 words
A METHOD OF PREPARING BENZENE MONOSULFONIC ACID WHICH COMPRISES REACTING BENZENE AND SO3 IN THE FORM OF A 60 TO 100% OLEUM IN ABOUT EQUAL MOLECULE PROPORTIONS IN THE PRESENCE OF FROM ABOUT 0.03 TO 0.2 MOL PER MOL OF BENZENE OF A MATERIALSELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SULFATES, ALKALI-EARTH METAL SULFATES, ALKALI METAL BENXZENE SULFONATES AND ALKALI-EARTH METAL BENZENE SULFONATES.
References Cited (Backward Citations)
US1708103A
Cited
US1179415A
Cited
US1207798A
Cited
US1228414A
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US1396320A
Cited
US1709447A
Cited
US1734050A
Cited
US1915925A
Cited
US1999955A
Cited
US2149662A
Cited
US2143963A
Cited
US2203440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |