Class 417/263 - With additional pumping member in parallel flow path

Subclass of Class 417 - Pumps
Definition: Apparatus in which in addition to the successive pumping
No. of patents: 2
Last issue date: 08/25/1998

Number	Title	Issue Date
5797452	Double-acting, deep-well fluid extraction pump This invention provides the structure and operation of a double-acting, deep-well fluid extraction pump assembly which includes a power piston housed on top of a pumping piston along with a power control system. The pumping piston has a dynamic, reciproca...	08/25/1998
4349321	Liquid dispensing systems A valve chamber connected to the inlet of a ram pump has an inlet connected to a source of sludge and a substantially smaller inlet connected to the outlet of a metering pump. A valve seat in the valve chamber has a ball resting freely thereon, and an ope...	09/14/1982

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