US Patent Issued to NHK SPRING on Nov. 3 for "Disc spring manufacturing method, and disc spring" (Japanese Inventors)

ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,781,823, issued on Nov. 3, was assigned to NHK SPRING Co. LTD. (Yokohama, Japan).

"Disc spring manufacturing method, and disc spring" was invented by Yoshio Yamada (Yokohama, Japan), Hideaki Sakai (Yokohama, Japan) and Shuji Takahashi (Yokohama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A disc spring manufacturing method is a method for manufacturing a disc spring including a spring body formed into an annular shape and having an outer circumferential surface, an inner circumferential surface, an outer circumferential edge, and an inner circumferential edge, and includes applying a compressive residual stress to at least an outer end portion i...