ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,436,340, issued on Oct. 7, was assigned to KOHOKU KOGYO Co. LTD. (Nagahama, Japan).
"Optical filter device" was invented by Katsuya Kito (Nagahama, Japan), Katsuhiro Iwasaki (Nagahama, Japan) and Tomoaki Kiriyama (Nagahama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical filter device includes: a first multi-core optical fiber including a plurality of first cores; a first lens; an optical filter which is rotated by a rotation angle about a rotation axis; a second lens; and an optical fiber including cores which the emission light beams from the second lens enter. When directions directed from a reference axis toward one side and another s...