ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,728,434, issued on Sept. 8, was assigned to APTAR DORTMUND GMBH (Dortmund, Germany).
"Valve spring, pump, dispensing unit and dispenser" was invented by Guido Burmann (Dortmund, Germany), Borje Hegenberg (Dortmund, Germany), Ralf Jordan (Dortmund, Germany) and Lukas Kurosky (Dortmund, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A valve spring made of plastic, in particular for pretensioning a valve stem against a valve seat of a dispensing unit for dispensing a preferably liquid product, is proposed, wherein the valve spring has a plurality of spring elements arranged axially one behind the other, in particular along an axis or longitudinal a...