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:
Dec. 15, 1998
Filed:
Apr. 26, 1995
Applicant:
Inventors:
Naoki Tomisawa, Atsugi, JP;
Shigeo Ohkuma, Atsugi, JP;
Assignee:
Unisia Jecs Corporation, Atsugi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61F / ;
U.S. Cl.
CPC ...
381 714 ; 381 715 ;
Abstract
In an apparatus and method for actively reducing air intake noise of an air intake system of a vehicular internal combustion engine, a sound wave having approximately the same amplitude, and a phase shifted by 180.degree. from the air intake sound wave, is generated from a sound wave generator to cancel the air intake sound, which is unpleasant to vehicular occupants.