Patents by Inventor Ronald W. Cowart

Ronald W. Cowart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of impressing and reading out a surface charge on a multi-layered detector structure
    Patent number: 4539591
    Abstract: 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 said surface charge of said photoconductive layer by exposing said detector to a modulated radiation flux capable of generating electron hole pairs in the photoconductor; scanning the surface of said partially discharged photoconductive layer with a small diameter photon beam whereby said surface charge is sequentially further discharged, and measuring the changing electric current of said sequential further discharge as a function of time.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: September 3, 1985
    Assignee: University of Texas System
    Inventors: Alfonso Zermeno, Lee M. Marsh, Jr., Ronald W. Cowart
  • Electrostatic imaging apparatus
    Patent number: 4521808
    Abstract: 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.
    Type: Grant
    Filed: July 6, 1981
    Date of Patent: June 4, 1985
    Assignee: University of Texas System
    Inventors: Poen S. Ong, Alfonso Zermeno, Lee M. Marsh, Jr., James M. Hevezi, Ronald W. Cowart
  • Realtime radiation exposure monitor and control apparatus
    Patent number: 4268750
    Abstract: An apparatus for measuring radiation exposure in realtime by measuring the charge flowing in an external circuit when radiation creates electron hole pairs, and thus allows discharge, of a duo-dielectric detector.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: May 19, 1981
    Assignee: The University of Texas System
    Inventor: Ronald W. Cowart