The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 1984
Filed:
Jun. 15, 1981
Yasuhiko Miyamoto, Ohmiya, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Apparatus for driving a surfboard comprising an internal combustion engine mounted on a box on rear portion of the surfboard and a water jet propelling device driven by the internal combustion engine for propelling the surfboard. The exhaust gas system and the water jet propelling device are provided in the box. A part of the jet water is used as a cooling water of the engine. The box comprises three superimposed cases having partitions, dividing the box into an exhaust gas passageway constituting a plurality of expansion chambers and passages for exhaust gases with the exhaust gas passageway defining a gas exhaust path arranged in three dimensions, thereby preventing entry of water from the outlet port through the exhaust gas passageway to the exhaust port of the engine.