Wells – With below and above ground modification – Above ground actuating means for below ground device
Reexamination Certificate
2007-04-05
2009-10-13
Neuder, William P (Department: 3672)
Wells
With below and above ground modification
Above ground actuating means for below ground device
C417S545000
Reexamination Certificate
active
07600563
ABSTRACT:
A pump jack system for reciprocating a pump rod string is made up of a base frame and piston drive cylinders mounted on the base frame with the upper end of the pump rod connected to the cylinder assemblies, the cylinder assemblies being operated in unison by a fluid control circuit communicating with inner and outer concentric fluid passages, and the pump rod string is counterbalanced by a fluid circuit which supplies pressure in an upward direction to each of the pistons on each upstroke and substantially reduces the pressure on each downstroke, the fluid circuit being selected from an inert gas alone or an inert gas pressurizing a hydraulic fluid. The fluid control circuit includes a directional control valve and timer, along with a fluid dampener, which is automatically responsive to dampen pressure surges and acceleration shocks at the beginning of each upstroke and downstroke.
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Neuder William P
Reilly John E.
The Reilly Intellectual Property Law Firm, P.C.
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