Robert T. Evans

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Access valve for drill stem testing

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Annulus pressure operated ratchet device

Wells – Packers or plugs – With detachable setting means
Patent

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Enhanced communication services and apparatus

Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent

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External cable grommet for cable entry of EMI protected cabinets

Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent

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Fiber optic connector

Patent

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Profile ID: LFUS-PAI-P-814228

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