1
Poen S Ong, Alfonso Zermeno, Lee M Marsh Jr, James M Hevezi, Ronald W Cowart: Electrostatic imaging apparatus. University of Texas System, Dula Shields & Egbert, June 4, 1985: US04521808 (44 worldwide citation)

An image scanning apparatus for obtaining radiographic information from a detector system. The apparatus produces a video signal by optical readout of a latent image found in a detector system. The video signal is processed and displayed to provide radiographic information.


2
Alfonso Zermeno, Lee M Marsh Jr, Ronald W Cowart: Method of impressing and reading out a surface charge on a multi-layered detector structure. University of Texas System, Dula Shields & Egbert, September 3, 1985: US04539591 (22 worldwide citation)

A method of recording and reading out a latent image which comprises placing a uniform surface charge on the photoconductive layer of a multilayered detector apparatus, biasing said photoconductive layer with an electric field whose polarity opposes said surface charge, discharging some portion of s ...


3
Poen S Ong, Alfonso Zermeno, Lee M Marsh Jr, James M Hevezi: Electrostatic imaging method. University of Texas System, Dula Shields & Egbert, May 1, 1984: US04446365 (17 worldwide citation)

A method of operating a photodetector system. The method impresses a surface charge on a photon detector by establishing an electric potential across the detector, storing the detector in the dark, disconnecting the source of electric potential, and electrically connecting layers in the detector.


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Alfonso Zermeno, Lee M Marsh Jr, James M Hevezi: Imaging by point absorption of radiation. The University of Texas, Arthur M Dula, Murray Robinson, Ned L Conley, April 18, 1978: US04085324 (1 worldwide citation)

Radiation is partially blocked by a pointlike absorber to establish a patterned flux whose intensity distribution is a function of source geometry. The flux strikes a receptor having a proper contrast to spatial frequency characteristic to map an image that is topologically equivalent to the source ...