ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,556, issued on May 19, was assigned to Mainline Scientific LLC (Malvern, Pa.).

"Sample holder for prism-based analytical instruments" was invented by Yousheng Mao (Hockessin, Del.) and Shouwen Xu (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is directed to a removable sample holder for analytical instruments or apparatuses that utilizes a prism. For example, sample devices of the invention can be used in a surface plasmon resonance (SPR) spectroscopy device, a plasmon-waveguided resonance (PWR) spectroscopic device, as well as other spectroscopy devices known to one skilled in the art that uses a prism. The present in...