ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,894, issued on March 25, was assigned to YAMAHA HATSUDOKI K.K. (Shizuoka, Japan).
"Marine propulsion device and marine vessel" was invented by Kimitaka Saruwatari (Shizuoka, Japan), Kenji Yukishima (Shizuoka, Japan) and Yu Wakamizu (Shizuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A marine propulsion device includes an engine, an exhaust pipe to allow exhaust gas of the engine to pass through the exhaust pipe, and a cooling water supply passage to supply cooling water for the engine into the exhaust pipe toward a downstream side in a flow direction of the exhaust gas and cause the cooling water to flow circumferentially along an inner...