4. Joints and connections
  5. Screw or cam

Christopher L. Drenth

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Braking devices for use in drilling operations

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or...
Reexamination Certificate

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Core barrel assemblies with braking devices

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Receiver removable through below-ground tool shaft
Reexamination Certificate

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Core barrel assembly with tapered design

Machines not elsewhere specified – Agricultural or construction machinery – Drilling – mining – or soil treatment
Design Patent

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Core barrel head assembly with tapered design

Machines not elsewhere specified – Agricultural or construction machinery – Drilling – mining – or soil treatment
Design Patent

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Core barrel latch body with axial grooves

Machines not elsewhere specified – Agricultural or construction machinery – Drilling – mining – or soil treatment
Design Patent

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Profile ID: LFUS-PAI-P-1286297

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