US2720550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrogenation of naphthenes by means of sulfur dioxide
Assignee: IOWA COLLEGE, University of, Trustees of
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Filing: 1952-08-09
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Granted: 1955-10-11
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Expires: 1972-08-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph D Danforth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:08
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/42; C07C5/46; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR THE PRODUCTION OF AROMATIC HYDROCARBONS WHICH COMPRISES REACTING A NAPHTHENE HYDROCARBON WITH SULFUR DIOXIDE IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF ACTIVATED CARBON AT A TEMPERATURE OF FROM 440* C. TO ABOUT 600* C. AND A PRESSURE OF FROM ABOUT 1/4 ATMOSPHERE TO ABOUT 500 ATMOSPHERES, SAID NAPTHENE HYDROCARBON BEING PRESENT IN MOL EXCESS OVER THE SULFUR DIOXIDE IN ORDER TO PREVENT FORMATION OF SULFUR.
Claim 2
Dependent Claim
70 words
A PROCESS FOR THE PRODUCTION OF AROMATIC HYDROCARBONS WHICH COMPRISES REACTING A NAPHTHENE HYDROCARBON WITH SULFUR DIOXIDE IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF ACTIVATED CARBON AT A TEMPERATURE OF FROM 440* C. TO ABOUT 600* C. AND A PRESSURE OF FROM ABOUT 1/4 ATMOSPHERE TO ABOUT 500 ATMOSPHERES, SAID NAPTHENE HYDROCARBON BEING PRESENT IN MOL EXCESS OVER THE SULFUR DIOXIDE IN ORDER TO PREVENT FORMATION OF SULFUR.
References Cited (Backward Citations)
US2126817A
Cited
US2626286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |