ALEXANDRIA, Va., July 3 -- United States Patent no. 12,343,673, issued on July 1, was assigned to Praxair Technology Inc. (Danbury, Conn.).

"Energy efficient VPSA system with direct drive high speed centrifugal compressors" was invented by Andrew C. Rosinski (Orchard Park, N.Y.), Nicholas R. Stuckert (Grand Island, N.Y.) and Yang Luo (Amherst, N.Y.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a method and system for improving VPSA plant energy and capital efficiency through optimizing direct drive variable speed centrifugal feed, vacuum, and/or product compressors to achieve lower unit gas product production cost. More specifically, the present invention relates to a new en...