US2581050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of dimethyl sulfoxide
Assignee: Centrallaboratorium AB
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Filing: 1948-07-19
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Granted: 1952-01-01
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Expires: 1968-07-19
Abstract
No abstract record available.
Inventors
- 👤 Smedslund Tor Halfdan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:28
CPC Classifications
C; C07; C07C; C07C317/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A CONTINUOUS METHOD FOR THE PRODUCTION OF DIMETHYL SULFOXIDE BY THE VAPOR PHASE OXIDATION OF DIMETHYL SULFIDE, WHICH COMPRISES MIXING AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND TEMPERATURE DIMETHYL SULFIDE VAPORT WITH AN OXYGEN CONTAINING GAS, CONTAINING SUFFICIENT OXYGEN TO OXIDIZE THE DIMETHYL SULFIDE TO THE SULFOXIDE, AND WITH A SMALL AMOUNT OF OXYGEN TRANSMITTING NITROGEN OXIDE SUFFICIENT ONLY TO CATALYZE THE OXIDATION REACTION WITHOUT CAUSING THE TEMPERATURE TO RISE ABOVE ABOUT 75* C. AND INSUFFICIENT TO FURNISH OXYGEN FOR THE SAID OXIDATION REACTION, PASSING THE RESULTING GASEOUS MIXTURE THROUGH A REACTION ZONE OF LARGE VOLUME WHILE RETAINING THE MIXTURE IN SAID ZONE UNTIL THE DIMETHYL SULFIDE IS OXIDIZED SUBSTANTIALLY TO DIMETHYL SULFOXIDE.
Claim 2
Dependent Claim
111 words
A CONTINUOUS METHOD FOR THE PRODUCTION OF DIMETHYL SULFOXIDE BY THE VAPOR PHASE OXIDATION OF DIMETHYL SULFIDE, WHICH COMPRISES MIXING AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND TEMPERATURE DIMETHYL SULFIDE VAPORT WITH AN OXYGEN CONTAINING GAS, CONTAINING SUFFICIENT OXYGEN TO OXIDIZE THE DIMETHYL SULFIDE TO THE SULFOXIDE, AND WITH A SMALL AMOUNT OF OXYGEN TRANSMITTING NITROGEN OXIDE SUFFICIENT ONLY TO CATALYZE THE OXIDATION REACTION WITHOUT CAUSING THE TEMPERATURE TO RISE ABOVE ABOUT 75* C. AND INSUFFICIENT TO FURNISH OXYGEN FOR THE SAID OXIDATION REACTION, PASSING THE RESULTING GASEOUS MIXTURE THROUGH A REACTION ZONE OF LARGE VOLUME WHILE RETAINING THE MIXTURE IN SAID ZONE UNTIL THE DIMETHYL SULFIDE IS OXIDIZED SUBSTANTIALLY TO DIMETHYL SULFOXIDE.
References Cited (Backward Citations)
US1864541A
Cited
GB442524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |