Patent US3244762A successfully refreshed from Google Patents.
US3244762A
Expired / Lapsed
US
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Solvent extraction process
Assignee: Union Oil Company of California
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Filing: 1961-09-29
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Granted: 1966-04-05
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Expires: 1981-09-29
Abstract
No abstract record available.
Inventors
- 👤 Art C Mckinnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:58
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD OF EXTRACTING DIAROMATIC HYDROCARBONS FROM A MIXTURE THEREOF WITH MONOAROMATIC AND NONAROMATIC HYDROCARBONS ARE DIFFICULT TO SEPARATE FROM SAID MIXTURE WITH NITROMETHANE TO FORM A RAFFINATE PHASE AND A NITROMETHANE EXTRACT PHASE IN WHICH THE RATIO OF DIAROMATIC HYDROCARBONS TO MONOAROMATIC AND NONAROMATIC HYDROCARBONS IS SUBSTANTIALLY GREATER THAN THE RATIO THEREOF IN SAID MIXTURE.
Claim 2
Independent Claim
56 words
A METHOD OF EXTRACTING DIAROMATIC HYDROCARBONS FROM A MIXTURE THEREOF WITH MONOAROMATIC AND NONAROMATIC HYDROCARBONS ARE DIFFICULT TO SEPARATE FROM SAID MIXTURE WITH NITROMETHANE TO FORM A RAFFINATE PHASE AND A NITROMETHANE EXTRACT PHASE IN WHICH THE RATIO OF DIAROMATIC HYDROCARBONS TO MONOAROMATIC AND NONAROMATIC HYDROCARBONS IS SUBSTANTIALLY GREATER THAN THE RATIO THEREOF IN SAID MIXTURE.
References Cited (Backward Citations)
US2023375A
Cited
US2407820A
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US2783287A
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US2756266A
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US2812372A
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US2952717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |