US Patent Issued to ERAE AMS on May 20 for "Heat treatment method for tubular shaft for drive shaft having ball spline structure and tubular shaft manufactured thereby" (South Korean Inventors)

ALEXANDRIA, Va., June 16 -- United States Patent no. 12,305,251, issued on May 20, was assigned to ERAE AMS Co. LTD. (Daegu, South Korea).

"Heat treatment method for tubular shaft for drive shaft having ball spline structure and tubular shaft manufactured thereby" was invented by Se Jung Park (Daegu, South Korea) and Dal Soo Jang (Daegu, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "in a heat treatment method for a tubular shaft for a drive shaft having a ball spline structure for a plunging and an undercut region with a reduced diameter, a carburizing-austempering is performed such that a deep portion hardness of the undercut region is a value between HRC 35 to HRC 50."

The patent was filed on...