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:
Jun. 30, 1992
Filed:
Mar. 02, 1989
Howard M Kingston, Jr, Gaithersburg, MD (US);
John M Riviello, Santa Cruz, CA (US);
Archava Siriraks, Rockville, MD (US);
United States of America, Washington, DC (US);
Abstract
A method for the detection of trace transition elements and rare earth elements in a sample also containing alkali metals or alkaline earth elements. The sample is flowed through a chelator column which retains the transition elements and rare earth elements. Then a first eluent (e.g. ammonium acetate) is passed through the column to strip the alkali and alkaline earth metals retained on the column. Then a second eluent (e.g. a strong acid) is passed through the chelator column to remove the transition elements in a chelator effluent which flows through an ion exchange resin concentrator to retain only the transition elements and rare earth elements. Then, a chelator complexing agent (e.g. pyridine-2,6 dicarboxylic acid or an oxalate) flows through the concentrator column to remove the transition elements and rare earth elements.