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. 23, 2002
Filed:
Jun. 06, 2000
Kevin Ian Michael Marston, Aylesbury, GB;
Andrew David Boddy, Aylesbury, GB;
Hozelock Limited, Aylesbury, GB;
Abstract
A filter assembly for filtering pond or aquarium water includes a container ( ) with an inlet chamber ( ) having an upstream region ( ) and a downstream outlet ( ) leading to an outlet chamber ( ). A filter ( ) is positioned in the inlet chamber ( ) between the upstream region ( ) and the outlet ( ). In use, progressive clogging of the filter causes the water pressure in the upstream region ( ) to rise until it reaches a predetermined threshold when a normally-closed relief valve ( ) opens to allow water to pass from the upstream region ( ) to the outlet chamber ( ) without passing through the filter ( ). The valve has a coloured valve stem ( ) providing a visual indication that the valve is open and that the filter is blocked and requires cleaning. In one embodiment, the outlet chamber ( ) contains a source ( ) of ultra-violet radiation to which the flow of water is exposed, regardless of whether the valve ( ) is in the open or closed condition.