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:
Mar. 24, 1992
Filed:
Jun. 03, 1991
Klaus Woltman, Demarest, NJ (US);
Allan H Willinger, Franklin Lakes, NJ (US);
Willinger Bros., Inc., Oakland, NJ (US);
Abstract
An aquarium filter assembly which can be utilized as a diatomaceous earth filter which is self-priming. The filter includes a housing having a pump means from which depends a filtering element. The water pumped through the filtering element can be directed either back into the housing for recirculation of the water in the housing, or out of the housing and back into the aquarium tank for filtering of the aquarium tank water. A valve within the housing operates to permit water entry into the housing upon initial insertion and during filtration of the aquarium tank water. The valve closes when the water flow from the filtering element is directed back into the housing. Diatomaceous earth can be added into the housing and the water recirculated within the housing serves to self-prime the filter element. After charging the filter element, the water flow from the filtering element is directed into the aquarium tank and the valve opens to permit regular filtering of the aquarium tank water.