ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,497, issued on June 17.
"Power transmission device" was invented by Dong-Hoon Park (Seongnam-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The power transmission device includes: a drive motor assembly including a motor housing, a first axial flow motor disposed in a front portion of the motor housing and rotating a first pinion gear in a first rotation direction, and a second axial flow motor disposed in a rear portion of the motor housing and operably coupled to a second pinion gear to rotate the second pinion gear in a second rotation direction opposite to the first rotation direction; a drum surrounding the drive motor assembly ...