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Annular sample chamber, full bore, APR.RTM. sampler

Wells – Receptacles
Patent

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Annulus pressure operated closure valve with reverse circulation

Wells – Receptacles
Patent

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Anti-freezing method and apparatus for ground surrounding liquif

Wells – Receptacles – With separate air chamber having openable passage
Patent

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Anti-wobbling bailer with high speed insertion

Wells – Receptacles
Utility Patent

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Apparatus and method for buffering submerged conduits

Wells – Receptacles – With separate air chamber having openable passage
Patent

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Apparatus and method for capturing and retrieving liquid sample

Wells – Receptacles
Patent

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Apparatus for delivering a flowable substance to a remote...

Wells – Receptacles – Lateral ports used in well
Reexamination Certificate

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Apparatus for enhanced bioremediation of underground contaminant

Wells – Receptacles – With separate air chamber having openable passage
Patent

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Apparatus for extracting oil or other fluids from a well

Wells – Receptacles
Reexamination Certificate

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Apparatus for guiding a load between a surface apparatus and a s

Wells – Receptacles – With separate air chamber having openable passage
Patent

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Apparatus for injecting material into a well-bore

Wells – Receptacles
Patent

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Apparatus for setting a bottom tool

Wells – Receptacles
Patent

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Composition of matter useful for earthen formation treatment

Wells – Receptacles – With separate air chamber having openable passage
Patent

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Compressor-assisted annular flow

Wells – Receptacles – Bottom receiving and side discharge valves
Patent

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Controlled buoyancy underwater riser system

Wells – Receptacles – With separate air chamber having openable passage
Patent

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Controlled slow descent bailer

Wells – Receptacles
Reexamination Certificate

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Delayed acting gravel pack fluid loss valve

Wells – Receptacles – Valve control means contacting well conduit wall
Reexamination Certificate

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Delayed opening fluid sampler

Wells – Receptacles
Patent

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Device for the transfer of plugging and grouting materials to, a

Wells – Receptacles – Readily releasable bottom valve
Patent

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Down hole well tool with pressure relief chamber

Wells – Receptacles – With separate air chamber having openable passage
Patent

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