ALEXANDRIA, Va., July 16 -- United States Patent no. 12,357,981, issued on July 15, was assigned to Johnson Matthey PLC (London).
"Particulate filters" was invented by Sabina Burmester (Royston, Great Britain), Thomas Hotchkiss (Royston, Great Britain), David Marvell (Royston, Great Britain) and Jonathon Paul Sapsford (Royston, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "Methods for treating a filter for filtering particulate matter from exhaust gas are disclosed in which a dry powder is sprayed towards an inlet face of the filter entrained in a primary flow of gas to pass through the inlet face to contact a porous structure of the filter. The back pressure of the filter is monitored during ...