143116 ⎘
Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps Counterbalancing
Sub-classes:LONG-STROKE PUMPING UNIT
#2Long-stroke pumping unit
#3Long-stroke pumping unit
#4Pumping hydrocarbon fluids from a well
#5LONG-STROKE PUMPING UNIT
#6Pumping unit counterweight balancing
#7Pumping unit counterweight balancing
#8Long stroke pumping unit
#9Direct drive pumping unit
#10Long-stroke pumping unit
#11Pumping machine
#12Non-beam pumping unit driven by a biaxial motor
#13Non-beam pumping unit driven by a motor reduction unit
#14Apparatus and methods for counterbalancing a pumping unit
#15Counterweighted pumpjack with reversible motors
#16Mobilized Tail Bearing Pumpjack
#17Reciprocating rod pumping unit
#18Long-stroke pumping unit
#19Long stroke pumping unit
#20Long-stroke pumping unit
#21Low profile rod pumping unit with pneumatic counterbalance for the active control of the rod string
#22Methods and apparatus to determine parameters of a pumping unit for use with wells
#23Pumping unit and counterbalance system for pumping units
#24SELF-ALIGNING, FLUID-DRIVEN PUMPING UNIT
#25COUNTERWEIGHTED PUMP JACK WITH REVERSIBLE MOTORS
#26OIL-PUMPING MACHINE
#27Counterbalance system for pumping units
#28Delivery device having a connecting rod, and a method for controlling a delivery device having a connecting rod and at least one balance weight
#29Cross-jack counterbalance system
#30Pumping unit driven by a linear electric motor
#31Pumping water from a natural gas well
#32Double-acting reciprocating downhole pump
#33Head with contiguous counterweight
#34Articulated reciprocating counterweight