Patent US3349140A successfully refreshed from Google Patents.
US3349140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Using ruthenium catalysts to prepare cis-isomers of polycyclic aromatics
Assignee: Standard Oil Co
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Filing: 1966-10-28
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Granted: 1967-10-24
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Expires: 1986-10-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Weitkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:28
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/04; C07; C07C; C07C5/00; C07C5/02; C07C5/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR THE PREPARATION OF AN INCREASED AMOUNT OF CIS-ISOMERS OF HYDROGENATED POLYCYCLIC AROMATIC HYDROCARBONS HAVING 2-3 FUSED CYCLIC UNITS WHEREIN SAID INCREASED AMOUNT IS GREATER THAN 90% OF THE TOTAL AMOUNT OF CIS-ISOMERS AND TRANS-ISOMERS WHICH PROCESS COMRISES CONTACTING POLYCYCLIC AROMATIC HYDROCARBON WITH A CATALYST CONSISTING ESSENTIALLY OF RUTHENIUM ON A NON-HYDROGENATING SUPPORT IN THE PRESENCE OF A HYDROGEN-AFFORDING GAS UNDER HYDROGENATION CONDITIONS, INCLUDING A TEMPERATURE BETWEEN ABOUT 25*C. AND ABOUT 200*C. AND A SUPERATMOSPHERIC PRESSURE WHICH DOES NOT EXCEED 3000 P.S.I.G.
Claim 2
Dependent Claim
84 words
A PROCESS FOR THE PREPARATION OF AN INCREASED AMOUNT OF CIS-ISOMERS OF HYDROGENATED POLYCYCLIC AROMATIC HYDROCARBONS HAVING 2-3 FUSED CYCLIC UNITS WHEREIN SAID INCREASED AMOUNT IS GREATER THAN 90% OF THE TOTAL AMOUNT OF CIS-ISOMERS AND TRANS-ISOMERS WHICH PROCESS COMRISES CONTACTING POLYCYCLIC AROMATIC HYDROCARBON WITH A CATALYST CONSISTING ESSENTIALLY OF RUTHENIUM ON A NON-HYDROGENATING SUPPORT IN THE PRESENCE OF A HYDROGEN-AFFORDING GAS UNDER HYDROGENATION CONDITIONS, INCLUDING A TEMPERATURE BETWEEN ABOUT 25*C. AND ABOUT 200*C. AND A SUPERATMOSPHERIC PRESSURE WHICH DOES NOT EXCEED 3000 P.S.I.G.
References Cited (Backward Citations)
US3183278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |