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:
Aug. 24, 2004
Filed:
Nov. 19, 2001
Yasuhiro Saito, Kanagawa, JP;
Nihon Genryo Co., Ltd., , JP;
Abstract
A filtration apparatus comprising a container that houses a filtration tank to which contaminated water is supplied, a cleansing tank, and a screw conveyor disposed within said cleansing tank is provided. Filtration media is housed within the cleansing tank and the container. The cleansing tank has lateral surface openings, lower openings, and an upper opening. When the screw conveyor rotates, filtration media as well as water (contaminated water) is conveyed upward from the lower openings to the upper opening while being agitated. At the same time, filtration media circulates between the cleansing tank and the container and is cleansed. When cleansing is complete, a backwash water supply pump backwashes water, and expels contaminants separated and removed from the filtration media out of the container by an expulsion pump. Lateral surface doors close lateral surface openings by drive means only during cleansing (agitation). This structure increases the filtration area.