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:
Nov. 01, 2005
Filed:
Feb. 10, 2003
Shoji Morita, Kanagawa, JP;
Shoji Morita, Kanagawa, JP;
Hitachi, Ltd., Tokyo-to, JP;
Abstract
An oil filter unit has a drain valve device. The valve comprises a retainer axially movably received in a cylindrical bore of a drain passage at a position upstream of a valve seat. The retainer has a valve member holding end. A valve member is axially movably received in the retainer in such a manner as to be movable between a closed position where the valve member closes a drain bore of the valve seat and an open position where the valve member opens the drain bore. A coil spring is arranged to bias the retainer relative to the valve seat in such a direction as to cause the valve member to take the open position. The retainer has a projected portion that projects into the interior of a filter housing. When a filter element is properly set in the filter housing, the projected portion is pressed down to shift the retainer to a position to allow the valve member to take the closed position.