4. Pumps
  5. Motor driven
  6. Fluid motor

Donald E. Carrens

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Down hole hydraulically actuated pump

Pumps – Motor driven – Fluid motor
Patent

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Pump piston having ring lubrication means

Expansible chamber devices – With lubricating means – Piston has lubricant retaining or conducting means
Patent

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Reversing valve assembly for a fluid operated well pump

Pumps – Motor driven – Fluid motor
Patent

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Seal assembly

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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Profile ID: LFUS-PAI-P-843562

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