US2790708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for solvent extraction of oil or the like from solid organic particles
Assignee: Blaw Knox Co
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Filing: 1949-06-25
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Granted: 1957-04-30
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Expires: 1969-06-25
Abstract
No abstract record available.
Inventors
- 👤 George B Karnofsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:14
CPC Classifications
C; C11; C11B; C11B1/00; C11B1/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
IN A SOLVENT EXTRACTION SYSTEM FOR SOLID ORGANIC PARTICLES, THE STEPS COMPRISING IN COMBINATION, MOVING A SUPPORT ON WHICH SOLID ORGANIC PARTICLES REST THEIR WEIGHT TO CARRY THEM THROUGH A VAPOR SPACE IN A SOLVENT EXTRACTION ZONE, SUPPLYING SAID PARTICLES WIT H SOLVENT AND DRAINING SAID PARTICLES DURING SAID CARRYING, REMOVING AND IMMEDIATELY CONDENSING VAPORS FROM SAID ZONE, DIRECTLY RETURNING AT LEAST A PORTION OF THE RESULTING CONDENSATE TO SAID ZONE, REMOVING SAID PARTICLES FROM SAID ZONE AFTER EXTRACTION, DESOLVENTIZING SAID PARTICLES SO REMOVED IN THE PRESENCE OF HEAT, DIRECTLY RETURNING EVOLVED VAPORS FROM SAID DESOLVENTIZING TO SAID ZONE, REMOVING EXTRACT SOLUTION FROM SAID ZONE BELOW THE LEVEL OF SAID PARTICLES DURING SAID CARRYING, SEPARATING SUBSTANTIALLY PURE SOLVENT IN VAPOR FORM FROM SAID SOLUTION, AND RETURNING SAID SOLVENT IN VAPOR FORM TO SAID ZONE AT LEAST DURING THE INITIATION OF AN EXTRACTION CYCLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |