ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,558,833, issued on Feb. 24, was assigned to Addex Inc. (Newark, N.Y.).
"Controlled pressure enclosure" was invented by Robert E. Cree (Conroe, Texas) and William J. Randolph (Farmington, N.Y.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to an external cooling system for a molten film tube produced by a blown film tubular extrusion process, comprised of one or more enclosures with one or more respective cavities that directly receive a portion of cooling gas emanating from one or more associated cooling elements. Each enclosure includes a port containing a variable exhaust device and optional flow buffer, acting to maintai...