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:
Oct. 26, 2004
Filed:
Jun. 12, 2002
Eizou Kawano, Ibaraki, JP;
Takuya Maeoka, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki, JP;
Abstract
The present invention is to provide a filter medium for a turbine in which contamination is less likely to be caused in the turbine, and an increase in pressure loss is suppressed. One form of this filter medium includes a porous polytetrafluoroethylene (PTFE) membrane and an air-permeable supporting member. The air-permeable supporting member has a fiber diameter of not more than 15 &mgr;m. This filter medium is used by disposing the air-permeable supporting member on an upstream side of the porous PTFE membrane with respect to air flow passing through the filter medium toward the turbine. Another form of the filter medium of the present invention includes a porous PTFE membrane, a first air-permeable supporting member, and a second air-permeable supporting member.