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:
Sep. 17, 1991
Filed:
Oct. 31, 1990
Noriya Matsumoto, Okazaki, JP;
Hajime Akado, Anjo, JP;
Yoshihiko Oya, Kariya, JP;
Yoshihiro Taki, Nagoya, JP;
Shuji Yamaguchi, Toyokawa, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A filter element which is improved in filter performance and suitable for use in various types of filters, and a manufacturing method thereof. In the filter element, a multiplicity of tubes each formed of a filtering material and having a substantially circular shape in cross-section are arranged side by side into a tubular assembly with the axes of the tubes lying parallel to one another; inter-tube openings are closed at one end of the tubular assembly which end serves as the inlet side for a fluid to be filtered, whereas intra-tube openings are closed on the opposite end of the tubular assembly; and the total cross-sectional area of all the inter-tube openings is set smaller than the total cross-sectional area of all the intra-tube openings, but larger than the minimum cross-sectional area of a path through which the fluid is supplied to the tubular assembly. Specifically, one or more filtering materials including a plurality of tubes each having a substantially circular shape in cross-section and connecting portions to interconnect the adjacent tubes are rolled into a spiral shape to provide the tubular assembly with the axes of the tubes arranged side by side parallel to one another.