Other

Chalkbus, Inc.

Richard C Haas

Charles O Stokley

Charles O Stockley

Active power factor correction (PFC) circuits are used to minimize unwanted harmonic distortion in applications where AC electrical power is rectified to produce DC power needed for operating electrical equipment. A variable amplitude regulator (VAR) is a PFC control interface which is simpler to implement than conventional circuits, and offers a wider dynamic operating range. The VAR functions as a resistor scaling network using a two-stage RC filter to maintain the DC output voltage constant for various load conditions and to maintain the rectified current in phase with the sinusoidal circuit flow in an AC power line, through both slow and rapid changes in the load coupled to the direct current output. This control interface offers excellent performance characteristics and requires only a few components for a useful implementation.

Power factor controlled regulator with variable output voltage feedback

Variable amplitude regulator

Method and apparatus for drilling wells in which the annulus between the casing and drill string is sealed below the kelly and blowout preventers and drilling fluid returns are conducted from below the seal to the exterior through the drilling head. The annulus may be controlled below the seal to permit lubricating the seal through the blowout preventers while maintaining the well under complete control. A surface controlled subsurface valve may control drilling fluid returns.

Method and apparatus for drilling wells

A method of receiving returns from a well being drilled in which the hydrostatic pressure of the drilling fluid cannot contain the formation pressure and controlling the flow and pressure of the returns and separating the oil, gas, and drilling fluids on the surface and returning the drilling fluids to the well while disposing of the oil and gas.

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Corpus Christi, TX, United States of America

Richard C Haas