ALEXANDRIA, Va., March 3 -- United States Patent no. 12,566,366, issued on March 3, was assigned to SEIKO EPSON Corp. (Tokyo).

"Wavelength converter, light source apparatus, and projector" was invented by Koichi Akiyama (Azumino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A wavelength converter includes a substrate having a support surface, a first optical member including a first optical layer that transmits first light, a first wavelength conversion layer that is disposed at the support surface and converts the first light into second light, a second wavelength conversion layer that is disposed at a first wavelength conversion layer side with respect to the first optical layer and converts the fi...