4. Expansible chamber devices
  5. With guide or seal on cylinder end portion for piston or...

HP&T Products, Inc.

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Hydraulic actuator with built-in pressure compensator

Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Reexamination Certificate

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Hydraulic double acting valve actuator

Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Reexamination Certificate

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Hydraulic failsafe valve actuator

Expansible chamber devices – With guide or seal on cylinder end portion for piston or...
Reexamination Certificate

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Valve seal assemblies and methods

Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – With means to lower 'on' voltage drop
Reexamination Certificate

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Valve seal assemblies and methods

Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Reexamination Certificate

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