ALEXANDRIA, Va., March 5 -- United States Patent no. 12,239,973, issued on March 4, was assigned to The Regents of the University of California (Oakland, Calif.).

"Particle-drop structures and methods for making and using the same" was invented by Dino Di Carlo (Los Angeles) and Chueh-Yu Wu (Los Angeles).

According to the abstract* released by the U.S. Patent & Trademark Office: "Sub-millimeter scale three-dimensional (3D) structures are disclosed with customizable chemical properties and/or functionality. The 3D structures are referred to as drop-carrier particles. The drop-carrier particles allow the selective association of one solution (i.e., a dispersed phased) with an interior portion of each of the drop-carrier particles, while a s...