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:
Jun. 12, 2001
Filed:
Jul. 14, 1999
Naoki Maki, Kariya, JP;
Kenji Okabe, Kariya, JP;
Hideyuki Nakai, Obu, JP;
Kunihiro Umetsu, Anjo, JP;
Akiyoshi Mukaidani, Takahama, JP;
Denso Corporation, Kariya, JP;
Abstract
The filter apparatus is composed of a filter housing made of non-conductive material, a filter element made of conductive material contained in the filter housing, and a conductive plug with a sealing element. The filter housing has a bore and the conductive plug is inserted into the bore of the filter housing so that the clearance between the conductive plug and the filter housing is hermetically sealed by the sealing element. The conductive plug is connected in circuit to the filter element in a manner that a part of the plug is exposed out of the filter housing and an earth wire attached to the exposed portion of the plug. The static electricity generated in the filter apparatus is released via a conductive path extending from the filter element through the plug to the earth wire so that the electrostatic discharge may be prevented. The conductive plug is made of material having 10,to 10,&OHgr;·cm resistivity. Such a value of resistivity serves to assure not only an adequate conductivity for releasing the static electricity but also an adequate resistance for preventing the electrostatic discharge from the conductive plug, if the earth wire becomes off or its connection is forgotten.