Patent US3517482A successfully refreshed from Google Patents.
US2520006A
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US
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Vapor liquid solvent extraction process
Assignee: Standard Oil Development Co
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Filing: 1944-10-11
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Granted: 1950-08-22
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Expires: 1964-10-11
Abstract
No abstract record available.
Inventors
- 👤 Henry J Hibshman
- 👤 Robert H Lafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:34
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16; C10G7/00; C10G7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN THE PROCESS FOR EXTRACTING FROM A MINERAL OIL A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TOLUENE AND XYLENES IN WHICH VAPORS OF MINERAL OIL ARE INTRODUCED TO A TOWER AND LIQUID PHENOL IS INTRODUCED TO THE TOWER ABOVE THE POINT OF MINERAL OIL INTRODUCTION, THE IMPROVEMENT WHICH CONSISTS OF INTRODUCING LIQUID WATER TO THE UPPER PART OF THE TOWER ABOVE THE POINT OF PHENOL INTRODUCTION, SAID WATER BEING INTRODUCED IN A QUANTITY WITHIN THE RANGE OF 6 TO 41 VOLUME PERCENT BASED UPON THE VOLUME OF HYDROCARBONS
Claim 2
Dependent Claim
89 words
IN THE PROCESS FOR EXTRACTING FROM A MINERAL OIL A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TOLUENE AND XYLENES IN WHICH VAPORS OF MINERAL OIL ARE INTRODUCED TO A TOWER AND LIQUID PHENOL IS INTRODUCED TO THE TOWER ABOVE THE POINT OF MINERAL OIL INTRODUCTION, THE IMPROVEMENT WHICH CONSISTS OF INTRODUCING LIQUID WATER TO THE UPPER PART OF THE TOWER ABOVE THE POINT OF PHENOL INTRODUCTION, SAID WATER BEING INTRODUCED IN A QUANTITY WITHIN THE RANGE OF 6 TO 41 VOLUME PERCENT BASED UPON THE VOLUME OF HYDROCARBONS
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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) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |