ALEXANDRIA, Va., June 17 -- United States Patent no. 12,311,333, issued on May 27, was assigned to L'Air Liquide Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude (Paris).

"Reactor with catalyst unit replaceable in the course of operation and process for replacing a catalyst unit" was invented by Antonio Coscia (Hadamar, Germany), Dieter Ulber (Steinbach, Germany), Jan Cobbaut (Brussels) and Michael De Pauw (Antwerp, Belgium).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a reactor, in particular a reactor for purifying offgases. The reactor includes a plurality of housing openings which open into a housing shaft, wherein the housing shafts are fitted with cat...