76092464
Jul 20, 2000
Aug 20, 2002
Power operated downhole tools used for the drilling of oil and gas, namely, power operated fluid filters for selectively filtering and removing solids from downhole fluids; and power operated fluid circulators that cause downhole fluid to impact the interior of a casing or liner within a well bore to provide a cleaning action, and which select a path for fluid travel in a casing or liner within a well bore
Machinery