Patent US3005032A successfully refreshed from Google Patents.
US3005032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of naphthalenic from non-naphthalenic aromatic hydrocarbons using dimethyl sulfoxide
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-08-19
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Granted: 1961-10-17
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Expires: 1977-08-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Earle C Makin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:44
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A LIQUID PHASE PROCESS FOR SEPARATING NAPHTHALENIC HYDROCARBONS FROM A MIXTURE THEREOF WITH NON-NAPHTHALENIC AROMATIC HYDROCARBONS WHICH CONSISTS ESSENTIALLY OF CONTACTING SAID HYDROCARBON MIXTURE AT A TEMPERATURE RANGING FROM 10*C. TO 150*C. WITH A SOLVENT COMPOSED OF DIMETHYL SULFOXIDE CONTAINING AN AMOUNT OF WATER RANGING FROM 0.5 TO 40 VOLUME PERCENT WHICH IS SUFFICIENT TO PERMIT THE SEPARATION OF AN EXTRACT PHASE AND A RAFFINATE PHASE, SAID SOLVENT BEING EMPLOYED IN A SOLVENT TO HYDROCARBON MIXTURE VOLUME RATIO OF FROM ABOUT 0.5:1 TO ABOUT 20:1, SEPARATING AN EXTRACT PHASE AND A RAFFINATE PHASE AND RECOVERING NAPHTHALENIC HYDROCARBONS FROM THE EXTRACT PHASE.
Claim 2
Dependent Claim
101 words
A LIQUID PHASE PROCESS FOR SEPARATING NAPHTHALENIC HYDROCARBONS FROM A MIXTURE THEREOF WITH NON-NAPHTHALENIC AROMATIC HYDROCARBONS WHICH CONSISTS ESSENTIALLY OF CONTACTING SAID HYDROCARBON MIXTURE AT A TEMPERATURE RANGING FROM 10*C. TO 150*C. WITH A SOLVENT COMPOSED OF DIMETHYL SULFOXIDE CONTAINING AN AMOUNT OF WATER RANGING FROM 0.5 TO 40 VOLUME PERCENT WHICH IS SUFFICIENT TO PERMIT THE SEPARATION OF AN EXTRACT PHASE AND A RAFFINATE PHASE, SAID SOLVENT BEING EMPLOYED IN A SOLVENT TO HYDROCARBON MIXTURE VOLUME RATIO OF FROM ABOUT 0.5:1 TO ABOUT 20:1, SEPARATING AN EXTRACT PHASE AND A RAFFINATE PHASE AND RECOVERING NAPHTHALENIC HYDROCARBONS FROM THE EXTRACT PHASE.
References Cited (Backward Citations)
US2304289A
Cited
US2319813A
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US2365898A
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US2615057A
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US2773918A
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US2878261A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |