ALEXANDRIA, Va., June 9 -- United States Patent no. 12,285,704, issued on April 29, was assigned to Dionex Corp. (Sunnyvale, Calif.).
"Sulfonamide based anion exchange resins" was invented by Melvin Hatch (Socorro, N.M.), Christopher A. Pohl (Union city, Calif.) and Manikandan Jayaraman (San Jose, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An ion exchange resin for use as a stationary phase in an ion chromatography column. The ion exchange resin has a negatively charged substrate particle, a positively charged polymer layer bound to the negatively charged substrate particle, a linker, and an ion exchange group. The ion exchange group includes a sulfonamide group and an amine, in which the ion exch...