The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1995
Filed:
Jun. 07, 1993
David L Stalling, Columbia, MO (US);
Thomas S Wood, Columbia, MO (US);
Kevin P Kelly, Columbia, MO (US);
Leemer G Cernohlavek, Fulton, MO (US);
Philip D Lochhaas, Columbia, MO (US);
Loren C Schrier, Hallsville, MO (US);
David M Strumpf, Columbia, MO (US);
Analytical Bio-Chemistry Laboratories, Inc., Columbia, MO (US);
Abstract
An improved liquid/liquid solvent extraction method and apparatus utilizes an external electrode for creating an electric field within an extraction cell to shatter aqueous sample droplets flowing within a non-conductive solvent. The external electrode is in intimate contact with the exterior surface of the insulative cell wall so as to preclude direct electrical contact between the electrode and the internal liquids. A sample interface detector permits the interface between the two liquids to be detected when the liquids sequentially flow out from the cell, thereby facilitating separate collection of the liquid. Interface detection is achieved by coupling electrical pulses into the flowing liquid to cause ionization charge/discharge cycles in the conductive aqueous sample but not in the non-conductive solvent. Downstream detection of the charge/discharge cycle in the liquid identifies the interface.