ALEXANDRIA, Va., Feb. 19 -- United States Patent no. 12,228,435, issued on Feb. 18, was assigned to Ichor Systems Inc..
"Flow control system, method, and apparatus" was invented by Daniel T. Mudd (Reno, Nev.) and Patti J. Mudd (Reno, Nev.).
According to the abstract* released by the U.S. Patent & Trademark Office: "In one embodiment, a method for delivering a gas at a predetermined rate includes providing a gas flow control apparatus comprising a gas flow path extending from a gas inlet to a gas outlet, a proportional valve coupled to the gas flow path, an on/off valve coupled to the gas flow path, a volume being defined between the proportional valve and the on/off valve, and a flow restrictor having a flow impedance located downstream o...