ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,147, issued on June 17, was assigned to Basell Polyolefine GmbH (Wesseling, Germany).
"Apparatus and process for the gas-phase polymerization" was invented by Giuseppe Penzo (Mantova, Italy), Maurizio Dorini (Ferrara, Italy), Riccardo Rinaldi (Ferrara, Italy), Silvia Soffritti (Ferrara, Italy) and Giulia Mei (Ferrara, Italy).
According to the abstract* released by the U.S. Patent & Trademark Office: "Apparatus for carrying out a catalytic gas-phase olefin polymerization having a first polymerization zone for growing polymer particles to flow upward under fast fluidization or transport conditions, a second polymerization zone for the growing polymer particles to flow downward, and...