4. Wells
  5. Processes
  6. Freeing stuck object, grappling or fishing in well

Timothy Donoughue

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Coated metal particles to enhance oil field shaped charge...

Ammunition and explosives – Blasting – Detonation wave modifying
Reexamination Certificate

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Deep penetrating focused array

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Reexamination Certificate

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Perforating gun quick connection system

Wells – Means for perforating – weakening – bending or separating pipe... – Perforating or splitting cutter
Reexamination Certificate

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Use of electromagnetic acoustic transducers in downhole...

Wells – Processes – With indicating – testing – measuring or locating
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Well pressure activated pack-off head

Wells – Above ground apparatus – With seal for reciprocating member
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Profile ID: LFUS-PAI-P-2856728

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