David W Willson

US Patent:

46938362, Sep 15, 1987

Filed:

Apr 28, 1986

Appl. No.:

6/856406

Inventors:

David H. Willson - Farmington Hills MI

Assignee:

AMSTED Industries Incorporated - Chicago IL

International Classification:

B01D 2902
B01D 3338

US Classification:

210791

Abstract:

A filter apparatus and method is provided wherein a tank is adapted to receive unfiltered liquid. An outlet chamber is located adjacent the bottom wall of the filter tank and is separated therefrom by a perforated plate. A filter media is movable across the rear, bottom and front walls of the filter tank and accordingly, unfiltered liquid must pass through the filter media as well before entering the outlet chamber. A chain flight assembly is provided which is movable across the filter media along the rear, bottom and front walls of the filter tank. As the chain flight assembly is continuous, a return path is across the top of the tank above the unfiltered liquid. A baffle plate is provided near the rear wall within the filter tank. This baffle plate extends sideways to near each side wall of the filter tank, upwardly above the level of the unfiltered liquid within the filter tank and downwardly to a point just above the flights of the chain flight assembly above the filter media at the bottom of the filter tank. A spray header is provided to spray filtered liquid between the rear wall of the filter tank and the baffle to prevent unfiltered liquid from bypassing the bottom of the baffle and entering the outlet chamber without passing through the filter media.

US Patent:

43965059, Aug 2, 1983

Filed:

Dec 10, 1981

Appl. No.:

6/329178

Inventors:

David H. Willson - Farmington Hills MI
Thomas C. Adams - Farmington MI

Assignee:

Amsted Industries Incorporated - Chicago IL

International Classification:

B01D 2936

US Classification:

210 97

Abstract:

A filtering device including a tank partially located below floor level having a filtrate compartment and a filter means interposed therebetween. Reservoir means and an end suction centrifugal pump means both located substantially on floor level wherein conduit means selectively permits the filtrate level in the reservoir to maintain a positive pressure at the inlet of the pump when pump is shut off, and to neutralize the pressure differential between the filtrate compartment and the tank.

US Patent:

45713022, Feb 18, 1986

Filed:

Dec 31, 1984

Appl. No.:

6/687975

Inventors:

David H. Willson - Farmington Hills MI

Assignee:

AMSTED Industries Incorporated - Chicago IL

International Classification:

B01D 2936
B01D 2942

US Classification:

210791

Abstract:

A filter system and method are provided utilizing a filter tank separated into an inlet compartment and a filtrate compartment by a filter media. Under normal filter operation, the liquid to be filtered enters the inlet compartment, is passed through the filter media and out the filtrate compartment by a pressure differential created across the filter media by a pump device. When the need arises to move the filter media as a result of the buildup of contaminents on it, it is necessary to alleviate the pressure differential across the filter media. Such pressure differential is alleviated by the controlled flowing of filtered liquid through an orifice in a closed valve into the filtrate compartment.