Donaldson Comapny, Inc.

Henry J Drasner, Iii

Andrew J Dallas

Stanley B Miller, Iii

Paul L Kojetin

Katsushi Isogawa

Kirk A Schneider

Cynthia D Bellefeuille

Suzan K Nunnink

Allan L Liebrenz

Paul Anthony Way

Andrew Alan Gilb

R David Forsgren

Roy E Fielder

An exhaust aftertreatment system for diesel engines includes a filtration station, a NOx reduction station, a temperature sensor, a pressure data generator, a NOx sensor, a reductant dispenser, and a controller. The filtration station filters particulate material from the exhaust. The NOx reduction station reduces NOx concentration in the exhaust. The temperature sensor generates first data that is representative of a temperature of the exhaust. The pressure data generator generates second data that is indicative of a pressure differential across a control volume that is located at the NOx reduction station. The control volume includes at least one catalyzed substrate. The NOx sensor generates third data that is representative of the NOx concentration in the exhaust. The reductant dispenser dispenses reductant into the exhaust. The controller controls a dosing rate of the reductant dispenser. The controller uses the first, second, and third data to determine the dosing rate.

Retrofit aftertreatment system for treating diesel exhaust

A filter is provided which includes an organic vapor adsorbing layer, a first particulate removal layer, and a second particulate removal layer. The organic vapor adsorbing layer includes porous adsorbent beads which allow air or gas to flow therethrough with little resistance and provide increased surface area by virtue of the pores. The particulate removal layer can be made from an electrostatic and/or polytetraflouroethylene. The filter can have a figure of merit greater than about 10 and a capacity for permanently adsorbing organic vapors, wherein the figure of merit is calculated based upon a fractional efficiency determined for particles having a size of 0.3 .mu.m in an air flow having a velocity of 10.5 ft./min and for Frazier permeability at 0.5 inches H.sub.2 O.

Filter and method for making a filter

A respirator cartridge having body, cover and filter media elements, and including a sealant dispersion member in one of the body or cover elements. The dispersion member directs the sealant material to the peripheral edge of the filter media without wetting the filtering surface of the media. An improved method for rotational molding filter media in/or for a filter assembly is also provided.

Respirator cartridge with sealant dispersion member

Growing community of inventors

Edina, MN, United States of America

Henry J Drasner, Iii