2022-11-28 - 10:02 ECODEVICES A US patent (11,469,574) has been issued by the United States Patent and Trademark Office (USPTO) on October 11, 2022. The patent covers our original MOCVD methods and device structures. Related Persons Kazuhiro Ohkawa Professor, Electrical and Computer Engineering CEMSE ECE ECODEVICES metalorganic vapor-phase epitaxy nitride semiconductor micro-light-emitting diodes