US Patent Issued to Graco Minnesota on Oct. 28 for "Landfill pump having metered cycling" (Michigan, Minnesota Inventors)

ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,454,965, issued on Oct. 28, was assigned to Graco Minnesota Inc. (Minneapolis).

"Landfill pump having metered cycling" was invented by Michael K. Lindquist (Plymouth, Mich.), Hunter C. Anstadt (Ann Arbor, Mich.), Mark T. Weinberger (Mounds View, Minn.) and William C. Allen III (Ypsilanti, Mich.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A landfill well pump is pneumatically powered to pump landfill liquid from a landfill well. The landfill well pump includes a choke on the pneumatic exhaust of the pump. The choke regulates flow the driving gas out of the landfill pump, maintaining pneumatic pressure in the pump and metering inflow of landfill liquid...