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:
Apr. 15, 1980
Filed:
Aug. 21, 1978
Akitoshi Iwatani, Muragame, JP;
Ishigaki Kiko Co., Ltd., Tokyo, JP;
Abstract
A filter apparatus wherein the filter tank is separated by a water-penetrable partition wall into an upper section forming a filtrate reservoir and a lower section forming a filter chamber. Floating filter medium is placed in the filter chamber. Water to be filtered is fed into the filter chamber at the bottom thereof and caused to flow upward, passing through the floating filter medium. The filtrate is removed from reservoir. The apparatus is further characterized by the improvement including: apparatus for agitating the filter medium, a pit beneath the filter chamber, a siphon-shaped discharge pipe for back-flow wash water with a discharge opening positioned adjacent the bottom of the pit, the discharge pipe being provided with a siphon breaker having an air feed port positioned adjacent the bottom of the filter chamber, a supply pipe for feeding water to be filtered into the filter chamber with a feed opening positioned adjacent the bottom of the filter chamber so as not to disturb water retained in the pit.