Patent US2825744A successfully refreshed from Google Patents.
US2825744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase oxidation
Assignee: Stepan Co
•
Filing: 1956-03-27
•
Granted: 1958-03-04
•
Expires: 1976-03-27
Abstract
No abstract record available.
Inventors
- 👤 Smedslund Tor Halfdan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:56
CPC Classifications
C; C07; C07D; C07D339/00; C07D339/08; C07B; C07B45/00; C07B45/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS FOR THE MANUFACTURE OF A LOW MOLECULAR WEIGHT SULFOXIDE FROM THE CORRESPONDING SULFIDE BY OXIDATION THEREOF, WHICH COMPRISES ADMIXING IN THE VAPOR PHASE THE SULFIDE, SUFFICIENT OXYGEN TO OXIDIZE THE SULFIDE TO THE SULFOXIDE AND AN AMOUNT OF OXYGEN TRANSMITTING NITROGEN OXIDE AT LEAST SUFFICIENT TO CATALYST THE OXIDATION, AND PASSING THE MIXTURE THROUGH A REACTION ZONE TO CARRY OUT THE OXIDATION IN VAPOR PHASE AT TEMPERATURES ABOVE ROOM TEMPERATURES BUT NOT IN EXCESS OF 200*F. THE IMPROVEMENT WHICH COMPRISES EXPOSING THE MIXTURE TO A SURFACE COOLED TO BELOW ROOM TEMPERATURE, WHILE CARRYING OUT THE OXIDATION IN SAID ZONE.
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR THE MANUFACTURE OF A LOW MOLECULAR WEIGHT SULFOXIDE FROM THE CORRESPONDING SULFIDE BY OXIDATION THEREOF, WHICH COMPRISES ADMIXING IN THE VAPOR PHASE THE SULFIDE, SUFFICIENT OXYGEN TO OXIDIZE THE SULFIDE TO THE SULFOXIDE AND AN AMOUNT OF OXYGEN TRANSMITTING NITROGEN OXIDE AT LEAST SUFFICIENT TO CATALYST THE OXIDATION, AND PASSING THE MIXTURE THROUGH A REACTION ZONE TO CARRY OUT THE OXIDATION IN VAPOR PHASE AT TEMPERATURES ABOVE ROOM TEMPERATURES BUT NOT IN EXCESS OF 200*F. THE IMPROVEMENT WHICH COMPRISES EXPOSING THE MIXTURE TO A SURFACE COOLED TO BELOW ROOM TEMPERATURE, WHILE CARRYING OUT THE OXIDATION IN SAID ZONE.
References Cited (Backward Citations)
US2581050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |