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:
Jan. 31, 2006
Filed:
Jun. 04, 2002
Applicant:
Hiroyuki Nakajima, Ritto, JP;
Inventor:
Hiroyuki Nakajima, Ritto, JP;
Assignees:
Kureha Ltd., Shiga, JP;
Toyoda Boshoku Corporation, Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 31/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A nonwoven fabric for a filter excellent in cleaning efficiency and trapped matter retention volume is constructed by two or more different kinds of fibrous layers placed one over the other. The nonwoven fabric has an average pore size from 30 μm inclusive to 60 μm inclusive and a total pore area at 0.011 cm/cmor more with respect to an entire surface of the nonwoven fabric. The average pore size is calculated according to a bubble point method as defined in ASTM F-316-80 with use of a Coulter Porometer II.