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. 16, 2004
Filed:
Nov. 25, 2002
Applicant:
Inventors:
Seiichi Tanaka, Saitama, JP;
Kazutaka Yokoyama, Saitama, JP;
Hiroto Koura, Hyogo, JP;
Tsumoru Okada, Hyogo, JP;
Shinsuke Mizuta, Hyogo, JP;
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
B01D 2/706 ; B01D 2/907 ; B01D 4/610 ;
U.S. Cl.
CPC ...
B01D 2/706 ; B01D 2/907 ; B01D 4/610 ;
Abstract
A filter element is made of a first filtering member, and a second filtering member that is arranged on a downstream side of the first filtering member and is impregnated with an oil. The first filtering member consists of a downstream wet layer that is impregnated with the oil, which is transferred by contact to the second filtering member, and an upstream dry layer that is not impregnated with the oil. A density of the first filtering member may be set smaller than that of the second filtering member.