The Standard Oil Company

Other

Lim H Cheung

John K Grady

A radiotherapy system comprising an X-ray tube operating at 100 to 800 kVp for providing X-ray beams of 50 mm diameter or less (and preferably approximately 30 mm or less) and configured to move the entrance beam footprint on the body during irradiation to any arbitrary sequential position set that has been predetermined to limit the intervening tissue dose rate at any one location to a safe level, such that the sum of the skin area traversed during treatment is 20 to 100 times the beam area.

Small beam area, mid-voltage radiotherapy system with reduced skin dose, reduced scatter around the treatment volume, and improved overall accuracy

A vibrator and method for transmitting seismic signals into the earth to obtain data on various subsurface characteristics. The vibrator is driven with piezoelectric transducers, and can produce better signal resolution at higher frequencies than is possible with hydraulic vibrators. The piezoelectric vibrators can be used in various embodiments at the earth's surface, within a borehole, or while permanently buried in the earth.

Piezoelectric seismic vibration device and method

A vibrator and method for transmitting seismic signals into the earth to obtain data on various subsurface characteristics. The vibrator is driven with piezoelectric transducers which can operate below 500 Hz, and can produce better signal resolution at higher frequencies than is possible with hydraulic vibrators. The piezoelectric vibrators can be used in various embodiments at the earth's surface, within a borehole, or while permanently buried in the earth.

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Carrollton, TX, United States of America

Lim H Cheung