ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,528,081, issued on Jan. 20, was assigned to FITBIT LLC (San Francisco).

"Binding assay with no wash steps or moving parts using magnetic beads" was invented by Herschel Watkins (Woodacre, Calif.) and Kristy McKeating (San Francisco).

According to the abstract* released by the U.S. Patent & Trademark Office: "This present disclosure provides devices, systems, and methods for performing point-of-care analysis of a target analyte in a biological fluid via a binding assay. The present disclosure includes a cartridge for collecting the target analyte contained in a fluid sample and performing an assay. The cartridge includes an assay stack having a first separation layer, a second separat...