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Composite landing collar for cementing operation

Wells – Pistons – fluid driven into well – With stop
Reexamination Certificate

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Compressible darts and methods for using these darts in...

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Control of `U` tubing in the flow of cement in oil well casings

Wells – Pistons – fluid driven into well
Patent

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Coupling for releasing tubing strings from downhole tools

Wells – Pistons – fluid driven into well – With stop
Patent

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Device for controlling the flow of fluid in an oil well

Wells – Pistons – fluid driven into well – With downflow past piston
Patent

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Downhole apparatus

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Downhole cementing tool assembly

Wells – Pistons – fluid driven into well
Patent

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Downhole cementing tool assembly

Wells – Pistons – fluid driven into well
Patent

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Downhole surge tools

Wells – Pistons – fluid driven into well – Surrounding conduit valve or closure opened by piston
Patent

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Drill wiper assembly

Wells – Pistons – fluid driven into well
Patent

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Drillpipe sub

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Freely moving oil field assembly for data gathering and or...

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Hydraulic lock alleviation device, well cementing stage tool, an

Wells – Pistons – fluid driven into well – Surrounding conduit valve or closure opened by piston
Patent

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Interior coating of gas well tubing

Wells – Pistons – fluid driven into well
Patent

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Method and apparatus for the multiple stage cementing of a casin

Wells – Pistons – fluid driven into well – Surrounding conduit valve or closure opened by piston
Patent

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Method for drilling and casing a wellbore with a pump down...

Wells – Pistons – fluid driven into well – With downflow past piston
Reexamination Certificate

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Non-rotating cement wiper plugs

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Non-rotating plug

Wells – Pistons – fluid driven into well
Patent

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Non-rotating plug set

Wells – Pistons – fluid driven into well
Patent

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Packer nose assembly

Wells – Pistons – fluid driven into well
Patent

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