4. Ammunition and explosives
  5. Blasting
  6. Borehole loading

Zheng Rong Xu

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Downhole application for a backpressure valve

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Impermeable and composite perforating gun assembly components

Ammunition and explosives – Blasting – Borehole loading
Reexamination Certificate

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Packer cup systems for use inside a wellbore

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Packer cups for use inside a wellbore

Wells – Packers or plugs – Cup type
Reexamination Certificate

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Universal downhole tool control apparatus and methods

Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2450193

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