ALEXANDRIA, Va., June 9 -- United States Patent no. 12,287,144, issued on April 29, was assigned to Chart Energy & Chemicals Inc. (Ball Ground, Ga.).
"Hydrogen liquefaction system and method" was invented by Brent A. Heyrman (The Woodlands, Texas), Timothy P. Gushanas (Pearland, Texas), Ravikumar Vipperla (Katy, Texas), Mathew R. Watt (Conroe, Texas) and Douglas A. Ducote Jr. (The Woodlands, Texas).
According to the abstract* released by the U.S. Patent & Trademark Office: "A system and method for liquefying a hydrogen gas feed stream uses a pre-cooling refrigerant for pre-cooling the feed stream, where the pre-cooling refrigerant is compressed, cooled and then separated to provide high pressure mixed refrigerant vapor and liquid streams....