Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yasuhiro Saito0
Date of Patent
November 16, 2021
0Patent Application Number
170546880
Date Filed
May 13, 2019
0Patent Primary Examiner
Patent abstract
A filtration apparatus includes a filtration tank; a layer of filtration media that filters supplied raw water by passing the raw water therethrough within the interior of the filtration tank; and a screw cleansing mechanism having a cylindrical outer cylinder which is provided within the filtration tank in a vertical orientation, a spiral shaped screw which is provided such that the long axis thereof extends in the longitudinal direction of the outer cylinder, and a screw driving member for rotating the screw, that scrubs and cleans filtration media by rotating the screw. The screw is in the shape of a coil spring.
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