ALEXANDRIA, Va., April 7 -- United States Patent no. 12,595,431, issued on April 7, was assigned to TEKNOLOGIAN TUTKIMUSKESKUS VTT OY (Espoo, Finland).

"Method and apparatus for purifying gas and use" was invented by Esa Kurkela (Vtt, Finland) and Ilkka Hiltunen (Vtt, Finland).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a method and an apparatus for purifying gas, wherein the gas which includes at least tars and/or undesired hydrocarbons is supplied to a catalytic treatment reactor which has at least one catalyst zone including at least one catalyst element with a catalyst, oxygen gas is fed into the catalyst element of the catalyst zone in the catalytic treatment reactor and is su...