ALEXANDRIA, Va., June 25 -- United States Patent no. 12,339,233, issued on June 24, was assigned to Siemens Healthineers Nederland B.V. (The Hague, Netherlands).

"Optical detection of a substance in fluid" was invented by Jacobus Hermanus Maria Neijzen (Heeze, Netherlands), Jeroen Hans Nieuwenhuis (Waalre, Netherlands), Arie Rombertus Van Doorn (Zaltbommel, Netherlands) and Matthias Irmscher (Eindhoven, Netherlands).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a system (1) for optically detecting at least one substance in a fluid (200). The system (1) comprises particles (400, 410) arranged to be dispersed in the fluid (200), each one comprising a magnetic bead (400) and an agent (4...