US2593931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering selective solvents
Assignee: MW Kellogg Co
•
Filing: 1947-12-31
•
Granted: 1952-04-22
•
Expires: 1967-12-31
Abstract
No abstract record available.
Inventors
- 👤 Walter V Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:51
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/30; C10G21/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN THE FRACTIONATION OF A SOLVENT EXTRACT LSOLUTION CONTAINING EXTRACT, A LOWER-BOILING SOLVENT AND AN ANTI-SOLVENT WHICH HAS A BOILING POINT LOWER THAN SAID SOLVENT, WHEREIN SAID SOLUTION IS SUBJECTED TO FRACTIONAL DISTILLATION IN A VERTICALLY EXTENDED FRACTIONATION ZONE TO SEPARATE A TOP DISTILLTE FRACTION CONTAINING SUBSTANTIALLY ALL OF SAID ANTI-SOLVENT, AND WHEREIN A RESIDUE OF SOLVENT AND EXTRACT IS WITHDRAWN FROM THE LOWER END OF SAID FRACTIONATION ZONE, THE IMPROVEMENT WHICH INCLUDES THE STEPS OF: WITHDRAWING A LIQUID SIDESTREAM FROM SAID FRACTIONATION ZONE AT A POINT SUFFICIENTLY BELOW THE POINT OF INTRODUCTION OF SAID SOLVENT EXTRACT SOLUTION TO OBTAIN A LIQUID SUBSTANTIALLY FREE TO SAID ANTI-SOLVENT; HEATING SAID LIQUID SIDESTREAM TO VAPORIZE A SUBSTANTIAL PART OF THE SOLVENT CONTENT THEREOF; RETURNING AT LEAST PART OF SAID SOLVENT VAPOR TO SAID FRAC-
Claim 2
Dependent Claim
132 words
IN THE FRACTIONATION OF A SOLVENT EXTRACT LSOLUTION CONTAINING EXTRACT, A LOWER-BOILING SOLVENT AND AN ANTI-SOLVENT WHICH HAS A BOILING POINT LOWER THAN SAID SOLVENT, WHEREIN SAID SOLUTION IS SUBJECTED TO FRACTIONAL DISTILLATION IN A VERTICALLY EXTENDED FRACTIONATION ZONE TO SEPARATE A TOP DISTILLTE FRACTION CONTAINING SUBSTANTIALLY ALL OF SAID ANTI-SOLVENT, AND WHEREIN A RESIDUE OF SOLVENT AND EXTRACT IS WITHDRAWN FROM THE LOWER END OF SAID FRACTIONATION ZONE, THE IMPROVEMENT WHICH INCLUDES THE STEPS OF: WITHDRAWING A LIQUID SIDESTREAM FROM SAID FRACTIONATION ZONE AT A POINT SUFFICIENTLY BELOW THE POINT OF INTRODUCTION OF SAID SOLVENT EXTRACT SOLUTION TO OBTAIN A LIQUID SUBSTANTIALLY FREE TO SAID ANTI-SOLVENT; HEATING SAID LIQUID SIDESTREAM TO VAPORIZE A SUBSTANTIAL PART OF THE SOLVENT CONTENT THEREOF; RETURNING AT LEAST PART OF SAID SOLVENT VAPOR TO SAID FRAC-
References Cited (Backward Citations)
US2185311A
Cited
US2111822A
Cited
US2168570A
Cited
US2115401A
Cited
US2167730A
Cited
US2178506A
Cited
US2312912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |