On September 29, 2009, U.S. Patent No. 7,596,466 issued to Keizo Ohta, on an INCLINATION CALCULATION APPARATUS AND INCLINATION CALCULATION PROGRAM, AND GAME APPARATUS AND GAME PROGRAM. Assigned to Nintendo Co., Ltd. the invention is the basis for the Wii gaming system:

Keizo is named as an inventor on at least 118 other patents assigned to Nintendo.