Background
In 2018, Hunting Titan, Inc. filed a petition for inter partes review (“IPR”) of U.S. Patent No. 9,581,422 (“the ’422 patent”), which is owned by DynaEnergetics Europe GmbH, a manufacturer of industrial explosives. In pertinent part, Hunting Titan asserted in its petition that claims 1-15 of the ’422 patent were unpatentable because they were