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. 17, 2008
Filed:
Apr. 03, 2002
Osamu Tanaka, Settsu, JP;
Kunihiko Inui, Settsu, JP;
Yoshiyuki Shibuya, Settsu, JP;
Hideyuki Kiyotani, Settsu, JP;
Osamu Tanaka, Settsu, JP;
Kunihiko Inui, Settsu, JP;
Yoshiyuki Shibuya, Settsu, JP;
Hideyuki Kiyotani, Settsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A method of manufacturing a filter medium that has a PF value that exceeds 32, the PF value calculated from the pressure loss and the collection efficiency of the filter medium according to the following formula:PF=[−log(permeability (%)/100)/(pressure loss (Pa)]×1000[Formula 1]in which permeability (%)=100−collection efficiency (%). In this method, 380 ml or more of a liquid lubricant at 20° C. is added per 1 kg of a PTFE fine powder, this compound is processed into a tape shape and elongated to obtain a PTFE porous film, and an air permeable support member is heat laminated to at least one surface of the PTFE porous film.