4. Wells
  5. Above ground apparatus
  6. Releasable seal or cleaner disengaged by projection on inner...

Vaughn R. Johnston

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Diverter apparatus

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent

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Drilling head method and apparatus

Boring or penetrating the earth – Processes
Patent

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Seal apparatus

Wells – Above ground apparatus – Releasable seal or cleaner disengaged by projection on inner...
Patent

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Stripper packer

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

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Stripper rubber on a steel core with an integral sealing gasket

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1292238

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