ALEXANDRIA, Va., July 28 -- United States Patent no. 12,695,436, issued on July 28, was assigned to DANMARKS TEKNISKE UNIVERSITET (Kongens Lyngby, Denmark).
"Density-modulated phononic membranes" was invented by Dennis Hoj (Kongens Lyngby, Denmark), Ulrich Busk Hoff (Kongens Lyngby, Denmark) and Ulrik Lund Andersen (Kongens Lyngby, Denmark).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a mechanical oscillator device comprising an unsupported membrane with a multitude of discrete mass elements distributed to form Phononic crystal cells in the form of regions of additional mass each comprising a plurality of mass elements. The phononic crystal structure has a defect for confining a mec...