US3709665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction apparatus
Assignee: Individual
•
Filing: 1970-06-15
•
Granted: 1973-01-09
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Expires: 1990-06-15
Abstract
Abstract A solvent extraction apparatus is provided wherein the materials being extracted flow countercurrently along the walls of a rotating cylinder in contact with each other. The apparatus may be either of the batch or the continuous type. Preferably a helical path is provided.
Inventors
- 👤 D Coulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0476; B01D11/048; B04; B04B; B04B5/00; B04B5/04; B04B5/0442; B04B2005/0457
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
A liquid-liquid solvent extraction apparatus as in claim 1, wherein outlet means is at the bottom of said vessel for removing a heavy liquid from the bottom of said vessel.
Claim 2
Dependent Claim
46 words
A liquid-liquid solvent extraction apparatus as in claim 2, wherein a baffle means is at said outlet for heavy liquid to insure that only heavy liquid is removed from said vessel through said outlet and enabling the light liquid to pass by the heavy liquid outlet.
Claim 3
Dependent Claim
30 words
A liquid-liquid solvent extraction apparatus as in claim 3, wherein the light and heavy liquid outlets are in the side of said wall at the top and bottom thereof, respectively.
Claim 4
Dependent Claim
66 words
A liquid-liquid solvent extraction apparatus as in claim 1, wherein an enlarged chamber is at the bottom of said vessel in open communication with the hollow, open center of said vessel, said chamber initially filled with a light liquid, said heavy liquid flowing downwardly along said wall from the heavy liquid inlet at the top of said vessel and displacing said light liquid from said chamber.
Claim 5
Dependent Claim
26 words
A liquid-liquid solvent extraction apparatus as in claim 1, wherein the means defining the helical path comprises a helical thread or groove cut in the wall.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |