4. Bearings
  5. Rotary bearing
  6. Antifriction bearing

Mark D. Zitka

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Downhole motor and bearing assembly

Bearings – Rotary bearing – Antifriction bearing
Patent

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Flexible coupling for downhole motor

Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent

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Progressive cavity pump/motor

Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-97276

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