US2998307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Countercurrent multiple batch continuous extractor
Assignee: JOHN G HOAD
•
Filing: 1958-03-25
•
Granted: 1961-08-29
•
Expires: 1978-03-25
Abstract
No abstract record available.
Inventors
- 👤 Walker Alexander Marriott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:58
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0269; B01D11/0273; B01D11/0276
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
IN A COUNTERCURRENT MULTIPLE BATCH CONTINUOUS EXTRACTOR COMPRISING AN ARCHIMEDEAN TYPE DRUM CONVEYOR INCLUDING A DRUM DISPOSED ON AN INCLINE AND A CONTINUOUS SPIRAL RIBBON TYPE CONVEYOR ELEMENT FIXED IN SEALED RELATIONSHIP TO SAID DRUM FORMING A PLURALITY OF 360 DEGREE FLIGHTS THEREIN, MEANS ROTATING SAID DRUM CONVEYOR WHEREBY TO CONVEY BATCHES OF MATERIAL THERETHROUGH WHILE CONTINUOUSLY MIXING THE SAME, MATERIAL INLET AND OUTLET MEANS AT THE LOWER UPPER ENDS OF SAID DRUM CONVEYOR RESPECTIVELY THROUGH WHICH BATCHES OF MATERIAL ENTER AND LEAVE SAID DRUM, A FRESH SOLVENT INLET MEANS INCLUDING A FIRST SOLVENT FILL LOCATED TO DISCHARGE INTO A SELECTED FLIGHT NEAR THE UPPER END OF SAID DRUM CONVEYOR, A FIRST SOLVENT AND SOLUTE DRAIN LOCATED AT THE UPPERMOST FLIGHT OF SAID DRUM CONVEYOR COMMUNICATING WITH AND INCLUDING A SECOND SOLVENT AND SOLUTE FILL LOCATED AT A SELECTED FLIGHT BELOW SAID FIRST SOLVENT FILL THROUGH WHICH SOLVENT AND SOLUTE ARE TRANSFERRED BY GRAVITY FROM SAID FIRST SOLVENT AND SOLUTE DRAIN TO SAID SECOND SOLVENT AND SOLUTE FILL, A SECOND SOLVENT AND SOLUTE DRAIN LOCATED AT THE SAID SECOND SELECTED FLIGHT ROTATABLY AHEAD OF SAID FIRST SOLVENT FILL COMMUNICATING WITH AND INCLUDING A THIRD SOLVENT AND
Claim 2
Dependent Claim
196 words
IN A COUNTERCURRENT MULTIPLE BATCH CONTINUOUS EXTRACTOR COMPRISING AN ARCHIMEDEAN TYPE DRUM CONVEYOR INCLUDING A DRUM DISPOSED ON AN INCLINE AND A CONTINUOUS SPIRAL RIBBON TYPE CONVEYOR ELEMENT FIXED IN SEALED RELATIONSHIP TO SAID DRUM FORMING A PLURALITY OF 360 DEGREE FLIGHTS THEREIN, MEANS ROTATING SAID DRUM CONVEYOR WHEREBY TO CONVEY BATCHES OF MATERIAL THERETHROUGH WHILE CONTINUOUSLY MIXING THE SAME, MATERIAL INLET AND OUTLET MEANS AT THE LOWER UPPER ENDS OF SAID DRUM CONVEYOR RESPECTIVELY THROUGH WHICH BATCHES OF MATERIAL ENTER AND LEAVE SAID DRUM, A FRESH SOLVENT INLET MEANS INCLUDING A FIRST SOLVENT FILL LOCATED TO DISCHARGE INTO A SELECTED FLIGHT NEAR THE UPPER END OF SAID DRUM CONVEYOR, A FIRST SOLVENT AND SOLUTE DRAIN LOCATED AT THE UPPERMOST FLIGHT OF SAID DRUM CONVEYOR COMMUNICATING WITH AND INCLUDING A SECOND SOLVENT AND SOLUTE FILL LOCATED AT A SELECTED FLIGHT BELOW SAID FIRST SOLVENT FILL THROUGH WHICH SOLVENT AND SOLUTE ARE TRANSFERRED BY GRAVITY FROM SAID FIRST SOLVENT AND SOLUTE DRAIN TO SAID SECOND SOLVENT AND SOLUTE FILL, A SECOND SOLVENT AND SOLUTE DRAIN LOCATED AT THE SAID SECOND SELECTED FLIGHT ROTATABLY AHEAD OF SAID FIRST SOLVENT FILL COMMUNICATING WITH AND INCLUDING A THIRD SOLVENT AND
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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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |