ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,529,385, issued on Jan. 20, was assigned to COVAL (Montelier, France).
"Multi-stage vacuum generator" was invented by Emmanuel Buffat (Mauves, France), Pierre-Louis Bal (Mirabel-Et-Blacons, France), Michel Cecchin (Montelier, France) and Pierre Milhau (Chatuzange-le-Goubet, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "A vacuum generator including a cluster of multi-stage venturi cells, each having a nozzle which is sealingly secured in an inlet orifice of a first mixer provided with a first suction orifice, and a second mixer fixed to the first mixer in such a manner that the second mixer extends coaxially to the first mixer and is spaced apart...