Class 417/508 - Including mechanical actuation

Subclass of Class 417 - Pumps
Definition: Apparatus in which in addition to the fluid reactive surface
No. of patents: 2
Last issue date: 10/21/2003

Number	Title	Issue Date
6634426	Determination of plunger location and well performance parameters in a borehole plunger lift system Plunger lift operations are difficult to optimize due to lack of knowledge of tubing pressure, casing pressure, bottom-hole pressure, liquid accumulation in the tubing and location of the plunger. Monitoring the plunger position in the tubing helps the op...	10/21/2003
4551072	Fluid pressure operated actuator A fluid pressure operated actuator, for example for controlling operation of a pneumatically driven metering pump for liquids. In a specific embodiment, the actuator is a rotary actuator and includes a piston/cylinder unit coupled at one end to a rack and...	11/05/1985

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