ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,746,452, issued on Sept. 29.
"Efficient and stable skate board" was invented by Jih-Wei Yeh (New Taipei City, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rolling unit includes a truck, a box, a transmission, an axle, two wheels, a hollow shaft, two driven bevel gears, two unidirectional bearings, an input gear, an output gear and an acceleration mechanism. The truck is connected to a deck of a skateboard. The box is pivotally connected to the truck. The transmission includes a driving bevel gear connected to the pinion. The pinion is located out of the box and engaged with a rack of the truck. The driving bevel gear is located in the box. T...