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:
Oct. 28, 2008
Filed:
Feb. 15, 2006
Tom Disch, Brookfield, WI (US);
Jeffrey P. Feist, Pewaukee, WI (US);
Kayne Kowis, Hartland, WI (US);
Elliot Matel, Milwaukee, WI (US);
Robert J. Rose, Hartford, WI (US);
Marvin Vissers, Oak Creek, WI (US);
Jeffrey H. Whitmore, Shorewood, WI (US);
Geoffrey P. Zabrowski, Racine, WI (US);
Tom Disch, Brookfield, WI (US);
Jeffrey P. Feist, Pewaukee, WI (US);
Kayne Kowis, Hartland, WI (US);
Elliot Matel, Milwaukee, WI (US);
Robert J. Rose, Hartford, WI (US);
Marvin Vissers, Oak Creek, WI (US);
Jeffrey H. Whitmore, Shorewood, WI (US);
Geoffrey P. Zabrowski, Racine, WI (US);
Briggs & Stratton Corporation, Wauwatosa, WI (US);
Abstract
The present invention provides a four-stroke internal combustion engine having reduced noise emissions. The engine includes a filter element having substantially flat inlet and outlet sides, a first housing portion, and a second housing portion coupled to the first housing portion. The first and second housing portions define an air chamber in which the filter element is supported. The second housing portion includes an interior surface, at least one protrusion to space the inlet side of the filter element from the interior surface, and an air passageway. The outlet of the air passageway is positioned adjacent the interior surface to deliver air to the air chamber between the interior surface and the inlet side of the filter element. A ratio of the volume of the air chamber to the length of the air passageway is between about 5 inand about 20 in.