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:
Apr. 22, 2003
Filed:
Feb. 27, 2002
Helmut Spannbauer, Moeglingen, DE;
Juergen Freisinger, Asperg, DE;
Filterwerk Mann & Hummel GmbH, Ludwigsburg, DE;
Abstract
An air filter ( ) for an internal combustion engine of a motor vehicle designed to transmit sound into the passenger compartment or driver area in order to inform the driver of the operating state of the engine. The air filter includes an air filter housing ( ), a filter insert ( ), an air inlet ( ) for unfiltered air, and an air outlet ( ) for filtered air. The air filter housing ( ) includes a housing wall ( ) in or on which at least one membrane ( ) is mounted. The membrane ( ) is made of a material which is more permeable to sound than the rest of the housing wall ( ), so that the shape and position of the membrane can be used to achieve a desired sound generation and distribution.