ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,503,487, issued on Dec. 23, was assigned to Genentech Inc. (South San Francisco, Calif.) and Hoffmann-La Roche Inc. (Little Falls, N.J.).

"Method for the reduction of host cell proteins in affinity chromatography" was invented by Paul McDonald (San Francisco), Richard St. John (Millbrae, Calif.), Marc Wong (San Carlos, Calif.), Roberto Falkenstein (Munich), Wolfgang Koehnlein (Benediktbeuern, Germany), Klaus Schwendner (Weilheim, Germany), Bernhard Spensberger (Eberfing, Germany), Michael Wiedmann (Penzberg, Germany), Frank Zettl (Neuried, Germany), Annika Kleinjans (Iffeldorf, Germany), Carina Kopp (PeiBenberg, Germany), Benjamin Tran (San Mateo, Calif.) and Ryan Erickson (Oakland, C...