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. 27, 1998
Filed:
Jun. 25, 1996
Applicant:
Inventor:
Takeshi Ito, Iwata, JP;
Assignee:
Yamaha Hatsudoki Kabushiki Kaisha, Iwata, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01L / ;
U.S. Cl.
CPC ...
123315 ; 123 9015 ;
Abstract
Several embodiments of multi-valve internal combustion engines, wherein low-speed hydrocarbon emissions are reduced by restricting the opening of at least one of the exhaust valves under this running condition. In addition, and in accordance with at least one of the embodiments, one of the intake valves is partially open during a portion of the exhaust cycle to further improve emission control.