Class 417/285 - Valve passage directly connecting concurrently contracting and expanding nonrotary pump chambers

Subclass of Class 417 - Pumps
Definition: Apparatus comprising a pump of the nonrotary expansible
No. of patents: 4
Last issue date: 08/15/2006

Number	Title	Issue Date
7090472	Pump or motor with interconnected chambers in the rotor Pump or motor having a rotor with chambers with a through rotation variable volume which are connectable via switches to either a first line connection or a second line connection. During switching between the line connections, the volume of the chamber changes and ...	08/15/2006
5573381	Internally regulated self priming fuel pump assembly A dual-piston fuel pump assembly includes a housing having an inlet to a primary chamber and an outlet from a pumping chamber. Between the primary and pumping chambers are interposed concentric inner and outer pistons. Each piston is independently spring ...	11/12/1996
4491061	Air conditioning system In an air conditioning system, a damper unit disposed in the middle of a circulating duct is controlled so that a throttle valve of at least one of air quantity regulating devices for controlling incoming outside air quantity and exhaust air quantity is f...	01/01/1985
4461613	Hydraulic pump with variable-stroke piston and generator using said pump The present invention relates to a double-acting hydraulic pump comprising a piston moving with a reciprocal rectilinear movement inside a cylinder of which each chamber is provided with a suction valve and a delivery valve, the rod of said piston being a...	07/24/1984

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