ALEXANDRIA, Va., July 16 -- United States Patent no. 12,667,992, issued on June 30, was assigned to Nanjing Chervon Industry Co. Ltd. (Nanjing, China).
"Chain saw" was invented by Toshinari Yamaoka (Nanjing, China) and Xuan Xu (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A chain saw includes a housing, an electric motor, a transmission system, a control system including a circuit board assembly, and a power supply assembly. The circuit board assembly obliquely intersects with a first straight line; in a direction of a second straight line perpendicular to a direction of the first straight line and extending along an up and down direction, the electric motor has a projection surface and the ...