US2948676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of solvent extraction by photoelectrically monitoring a phase therefrom
Assignee: Phillips Petroleum Co
•
Filing: 1956-05-28
•
Granted: 1960-08-09
•
Expires: 1976-05-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas Hutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:02
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0426; B01D11/0484
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A SOLVENT EXTRACTION OPERATION WHICH COMPRISES EXTRACTING A FEED STOCK WITH A SELECTIVE SOLVENT, OBTAINING AND REMOVING FROM THE OPERATION A RAFFINATE PHASE AND AN EXTRACT PHASE, SEPARATING EXTRACT PRODUCT FROM SAID EXTRACT PHASE AND RECYCLING A PORTION OF SAID EXTRACT PRODUCT AS A REFLUX FOR SAID EXTRACTION OPERATION, MONITORING AT LEAST ONE OF SAID REMOVED RAFFINATE PHASE AND EXTRACT PHASE BY PASSING AT LEAST A PORTION OF ONE OF SAID PHASES AS SAID PHASE THROUGH A PHOTOELECTRIC MONITOR WHEREIN LIGHT PASSED THROUGH SAID PHASE PASSING THROUGH SAID MONITOR IS PHOTOELECTRICALLY DETECTED RESULTING IN A CURRENT OF ELE-
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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) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |