06945755 is referenced by 17 patents and cites 48 patents.

A fluid level controlled pumping system includes a pumping unit disposed within a fluid cavity. The pumping unit includes an inlet operable to receive a fluid to be pumped from the fluid cavity. The system also includes a valve slidably coupled to the pumping unit. The valve includes a passage for receiving pumped fluid from an outlet of the pumping unit. In response to a decreasing fluid level within the fluid cavity, movement of the valve relative to the pumping unit aligns the passage with a port of the pumping unit to recirculate the pumped fluid from the outlet to the inlet.

Title
Fluid controlled pumping system and method
Application Number
10/627551
Publication Number
6945755 (B2)
Application Date
July 25, 2003
Publication Date
September 20, 2005
Inventor
Monty H Rial
Dallas
TX, US
Joseph A Zupanick
Pineville
WV, US
Agent
Fish & Richardson P C
Assignee
CDX Gas
TX, US
IPC
E21B 033/03
F04B 049/00
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