Minnesota Mining and Manufacturing Company

William T Fay

Stephen M Sanocki

Billy L George

Edward M Fischer

Richard L Bloom

Christine A Sobon

Joel H Sabean

Mark P Smith

Sankar B Narayan

Mark H Kayser

A method of inhibiting algae growth on an asphalt shingle surface exposed to varying humidity using a blend of copper-containing algae-resistant granules and non-algae-resistant granules. The copper-containing algae-resistant granules comprise a substrate granule having at least one inner ceramic coating layer comprising cuprous oxide and a seal coating having a thickness covering the inner layer and which is at time t.sub.o devoid of copper.

Method of inhibiting algae growth on asphalt shingles

An electrically regenerable diesel particulate trap or filter comprising an electrically resistive expanded metal sheet or sleeve which when energized heats the filter element to a temperature sufficient to allow the trapped soot particulates to burn.

Electrically regenerable diesel particulate trap

A diesel particulate trap has a filtering element which is a mass of fibrous filter material that radially fills a tubular casing. The filtering element employs lofty yarn extending in straight lines in a repeating pattern, which lines of lofty yarn have been compacted to form a plurality of fibrous walls that intersect to form tunnels extending in the axial or longitudinal direction of the casing. Some of the tunnels are filled with plugs that afford structural integrity while others of the tunnels remain open. The ends of the filtering element are covered by endplates. Substantially one-half of the open tunnels are axially aligned with openings in the inlet endplate and with imperforate areas in the outlet endplate, and the other open tunnels are axially aligned with openings in the outlet endplate and with imperforate areas in the inlet endplate. Exhaust gases entering tunnels open to the inlet pass through the compact fibrous walls and exit through tunnels open to the outlet.

Diesel particulate trap based on a mass of fibrous filter material

Growing community of inventors

Saint Paul, MN, United States of America

William T Fay