Patent US2770664A successfully refreshed from Google Patents.
US2770664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic hydrocarbons by solvent extraction with a solvent of diethylene glycol and water
Assignee: Dow Chemical Co
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Filing: 1951-11-09
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Granted: 1956-11-13
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Expires: 1971-11-09
Abstract
No abstract record available.
Inventors
- 👤 Lee H Horsley
- 👤 Victor S Morello
- 👤 Poffenberger Noland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:48
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A CONTINUOUS PROCESS FOR ISOLATING BENZENE IN A SUBSTANTIALLY PURE STATE FROM THE LIQUID HYDROCARBON PRODUCT OF THE VAPOR-PHASE CATALYTIC REFORMING AND CYCLIZATION IN THE PRESENCE OF HYDROGEN OF A GASOLINE FRACTION CONTAINING MAINLY HYDROCARBONS OF SIX AND SEVEN CARBON ATOMS PER MOLECULE, SUCH PRODUCT CONTAINING AT LEAST 10 PERCENT BY WEIGHT OF BENZENE AND AN APPRECIABLE PROPORTION OF OLEFINS NOT EXCEEDING ABOUT 3 PERCENT, WHICH COMPRISES INTRODUCING A STREAM OF THE HYDROCARBON PRODUCT INTO A COUNTERFLOW MULTISTAGE EXTRACTION SYSTEM NEAR THE MIDDLE, INTRODUCING A STREAM OF DIETHYLENE GLYCOL CONTAINING 0.5 TO 10 PERCENT BY WEIGHT OF WATER INTO ONE END OF THE SYSTEM INTO EXTRACTIVE CONTACT WITH THE HYDROCARBON PHASE THEREIN, WITHDRAWING A SREAM OF SUBSTANTIALLY
Claim 2
Dependent Claim
117 words
A CONTINUOUS PROCESS FOR ISOLATING BENZENE IN A SUBSTANTIALLY PURE STATE FROM THE LIQUID HYDROCARBON PRODUCT OF THE VAPOR-PHASE CATALYTIC REFORMING AND CYCLIZATION IN THE PRESENCE OF HYDROGEN OF A GASOLINE FRACTION CONTAINING MAINLY HYDROCARBONS OF SIX AND SEVEN CARBON ATOMS PER MOLECULE, SUCH PRODUCT CONTAINING AT LEAST 10 PERCENT BY WEIGHT OF BENZENE AND AN APPRECIABLE PROPORTION OF OLEFINS NOT EXCEEDING ABOUT 3 PERCENT, WHICH COMPRISES INTRODUCING A STREAM OF THE HYDROCARBON PRODUCT INTO A COUNTERFLOW MULTISTAGE EXTRACTION SYSTEM NEAR THE MIDDLE, INTRODUCING A STREAM OF DIETHYLENE GLYCOL CONTAINING 0.5 TO 10 PERCENT BY WEIGHT OF WATER INTO ONE END OF THE SYSTEM INTO EXTRACTIVE CONTACT WITH THE HYDROCARBON PHASE THEREIN, WITHDRAWING A SREAM OF SUBSTANTIALLY
References Cited (Backward Citations)
GB456958A
Cited
US2302383A
Cited
US2246297A
Cited
US2400802A
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US2409695A
Cited
US2407820A
Cited
US2449402A
Cited
US2492787A
Cited
US2478916A
Cited
US2514997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |