ALEXANDRIA, Va., July 9 -- United States Patent no. 12,350,867, issued on July 8.
"Method for producing gramophone records by injection moulding" was invented by Adrianus Martinus Gerardus Theunisse (Berghem, Netherlands) and Petrus Johannes Frederik Joseph Van Hout (Helmond, Netherlands).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for producing gramophone records by injection moulding, comprises the steps of heating polymeric material to liquefy said material, supplying liquid polymeric material under pressure from a feed zone to a space between two mould parts via a nozzle. The liquid polymeric material is passed through a single passage located in one of the mould parts and forced under pressur...