ALEXANDRIA, Va., March 17 -- United States Patent no. 12,580,363, issued on March 17, was assigned to Mitsubishi Electric Corp. (Tokyo).
"Optical semiconductor element" was invented by Kazuhiro Maeda (Tokyo), Hitoshi Sakuma (Tokyo) and Hitoshi Tada (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "This optical semiconductor element includes: a substrate; a first ridge formed on the substrate and having a first first-conductivity-type cladding layer, a first core layer, a first second-conductivity-type cladding layer, and a first contact layer in this order from a lower side, with first ridge grooves provided on both lateral sides of the first ridge; and a first electrode formed in contact with the first ...