ALEXANDRIA, Va., June 16 -- United States Patent no. 12,305,685, issued on May 20, was assigned to Yamaha Corp. (Hamamatsu, Japan).
"Fastening structure and keyboard device" was invented by Kaoru Fujishiro (Hamamatsu, Japan) and Ichiro Osuga (Hamamatsu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A fastening structure for fastening a to-be-fastened component to a wooden component by using a screw, wherein the wooden component is made of wood having a specific gravity of 0.08 g/cm3 to 0.85 g/cm3 inclusive, the screw has a nominal diameter of 0.8 mm to 3.5 mm inclusive, and the distance between a neutral position in a longitudinal direction of an effective screw part, which is the portion where the wo...