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:
Jan. 30, 1990
Filed:
Dec. 13, 1984
Applicant:
Inventor:
Masaki Okazaki, Shizuoka, JP;
Assignees:
Yamaha Hatsudoki, Shizuoka, JP;
Sanshin Kogyo, Shizuoka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B63H / ;
U.S. Cl.
CPC ...
440 89 ; 181272 ;
Abstract
Two embodiments of improved exhaust gas systems for outboard motors. In each system, the slow speed exhaust gases go through at least three expansions and contractions before discharge to the atmosphere. In one embodiment of the invention, the slow speed exhaust gases go through four expansions and contractions. In each embodiment of the invention, one of the expansion chambers has communication with another expansion chamber through a neck that is tuned whereby the neck and the one expansion chamber function as a Helmholtz resonator for tuning intermediate and high speed exhaust gas discharge.