Warner-lambert Company

Willinger Brothers, Inc.

Jonas Ivasauskas

Allan H Willinger

Steven Convertino

The present invention is directed to an aquarium undergravel filter. In particular, the undergravel filter of the present invention contains chambers on its underside. The chambers, which are roughly equal in size, are separated by baffles and have openings which allow water to flow into flow channels which lead to the lift tube holes. The chambers and flow channels provide for equal filtration over the entire surface of the filter plate. In a preferred embodiment, the undergravel filter of the present invention also contains an anti-dig grid which prevents fish from digging the gravel on the plate of the filter by use of an anti-dig grid. The anti-dig grid is located on the top surface of the filter and prevents fish from removing the gravel and exposing the openings in the filter.

Aquarium undergravel filter

Aquarium filter bag

A rotor impeller assembly for use with an electomagnetic stator unit including a shaft with a magnetic rotor directly mounted on the shaft. An impeller unit is rotationally mounted with respect to the shaft. A clutch between the magnetic rotor and the impeller unit rotationally drives the impeller unit by means of the magnetic rotor. The magnetic rotor is formed as an injection molded magnet. The impeller unit is used within an aquarium filter for drawing water from the aquarium tank into the aquarium filter for filtration and discharge back into the aquarium tank.

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West Nyack, NY, United States of America

Jonas Ivasauskas