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. 09, 2007
Filed:
Jul. 29, 2003
Yasuhiro Saito, Kawasaki, JP;
Yasuhiro Saito, Kawasaki, JP;
Nihon Genryo Co., Ltd., , JP;
Abstract
A filtration device that enables efficient cleansing and rinsing of filtration media within a short time, in which filtration sand is not likely to become clogged, and in which unevenness within filtration sand is not likely to occur comprising a screw conveyorprovided within a cleansing tank, which is suspended from the upper portion of a filtration tank, a spacebeing formed between a filter bedand a wire mesh, which are vertically separated, filtration mediaprovided on the wire mesh, and filtration media, having larger particle sizes than the filtration media, provided within the spaceand a plurality of strainersprovided in the filter bedand cleansing water spraying pipesprovided on an outer wall surrounding the spaceand after the screw conveyoris rotated and the filtration mediahas been cleansed, cleansing water is sprayed from a filtered water discharge pipeand the cleansing water spraying pipes, to expel contaminants through a raw water supply pipe