Patents by Inventor Victor Perez-Mendez

Victor Perez-Mendez 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).

  • Patent number: 5596198
    Abstract: A gamma ray camera for detecting rays emanating from a radiation source such as an isotope. The gamma ray camera includes a sensor array formed of a visible light crystal for converting incident gamma rays to a plurality of corresponding visible light photons, and a photosensor array responsive to the visible light photons in order to form an electronic image of the radiation therefrom. The photosensor array is adapted to record an integrated amount of charge proportional to the incident gamma rays closest to it, and includes a transparent metallic layer, photodiode consisting of a p-i-n structure formed on one side of the transparent metallic layer, and comprising an upper p-type layer, an intermediate layer and a lower n-type layer.
    Type: Grant
    Filed: April 22, 1994
    Date of Patent: January 21, 1997
    Assignee: The Regents, University of California
    Inventor: Victor Perez-Mendez
  • Patent number: 5548123
    Abstract: Apparatus for generating plural electrical signals in a single scan in response to incident X-rays received from an object. Each electrical signal represents an image of the object at a different range of energies of the incident X-rays. The apparatus comprises a first X-ray detector, a second X-ray detector stacked upstream of the first X-ray detector, and an X-ray absorber stacked upstream of the first X-ray detector. The X-ray absorber provides an energy-dependent absorption of the incident X-rays before they are incident at the first X-ray detector, but provides no absorption of the incident X-rays before they are incident at the second X-ray detector. The first X-ray detector includes a linear array of first pixels, each of which produces an electrical output in response to the incident X-rays in a first range of energies. The first X-ray detector also includes a circuit that generates a first electrical signal in response to the electrical output of each of the first pixels.
    Type: Grant
    Filed: December 6, 1994
    Date of Patent: August 20, 1996
    Assignee: Regents of the University of California
    Inventors: Victor Perez-Mendez, Claude A. Goodman
  • Patent number: 5427817
    Abstract: There is described a process for the vapor deposition of a scintillator phosphor composition with concomitant shadowing wherein the substrate to be processed is rotated through an arc relative to a vapor source of the scintillator phosphor composition whereby shadowing introduces voided gaps or interstices between columns as a result of the preferential components receiving more coating flux, particularly in the presence of oblique flux.
    Type: Grant
    Filed: November 2, 1993
    Date of Patent: June 27, 1995
    Assignee: University of California
    Inventors: Claude A. Goodman, Alan F. Lyon, Victor Perez-Mendez
  • Patent number: 5171996
    Abstract: Method and apparatus for producing separated columns of scintillation layer material, for use in detection of X-rays and high energy charged particles with improved spatial resolution. A pattern of ridges or projections is formed on one surface of a substrate layer or in a thin polyimide layer, and the scintillation layer is grown at controlled temperature and growth rate on the ridge-containing material. The scintillation material preferentially forms cylinders or columns, separated by gaps conforming to the pattern of ridges, and these columns direct most of the light produced in the scintillation layer along individual columns for subsequent detection in a photodiode layer. The gaps may be filled with a light-absorbing material to further enhance the spatial resolution of the particle detector.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: December 15, 1992
    Assignee: Regents of the University of California
    Inventor: Victor Perez-Mendez
  • Patent number: 5164809
    Abstract: Hydrogenated amorphous silicon radiation detector devices having enhanced signal are disclosed. Specifically provided are transversely oriented electrode layers and layered detector configurations of amorphous silicon, the structure of which allow high electric fields upon application of a bias thereby beneficially resulting in a reduction in noise from contact injection and an increase in signal including avalanche multiplication and gain of the signal produced by incoming high energy radiation. These enhanced radiation sensitive devices can be used as measuring and detection means for visible light, low energy photons and high energy ionizing particles such as electrons, x-rays, alpha particles, beta particles and gamma radiation. Particular utility of the device is disclosed for precision powder crystallography and biological identification.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: November 17, 1992
    Assignee: The Regents of the University of Calif.
    Inventors: Robert A. Street, Victor Perez-Mendez, Selig N. Kaplan
  • Patent number: 5117114
    Abstract: A radiation detector employing amorphous Si:H cells in an array with each detector cell having at least three contiguous layers (n type, intrinsic, p type), positioned between two electrodes to which a bias voltage is applied. An energy conversion layer atop the silicon cells intercepts incident radiation and converts radiation energy to light energy of a wavelength to which the silicon cells are responsive. A read-out device, positioned proximate to each detector element in an array allows each such element to be interrogated independently to determine whether radiation has been detected in that cell. The energy conversion material may be a layer of luminescent material having a columnar structure. In one embodiment a column of luminescent material detects the passage therethrough of radiation to be detected and directs a light beam signal to an adjacent a-Si:H film so that detection may be confined to one or more such cells in the array.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: May 26, 1992
    Assignee: The Regents of the University of California
    Inventors: Robert A. Street, Selig N. Kaplan, Victor Perez-Mendez
  • Patent number: 4465933
    Abstract: A wire chamber radiation detector (11) has spaced apart parallel electrodes (16) and grids (17, 18, 19) defining an ignition region (21) in which charged particles (12) or other ionizing radiations initiate brief localized avalanche discharges (93) and defining an adjacent memory region (22) in which sustained glow discharges (94) are initiated by the primary discharges (93). Conductors (29, 32) of the grids (18, 19) at each side of the memory section (22) extend in orthogonal directions enabling readout of the X-Y coordinates of locations at which charged particles (12) were detected by sequentially transmitting pulses to the conductors (29) of one grid (18) while detecting transmissions of the pulses to the orthogonal conductors (36) of the other grid (19) through glow discharges (94). One of the grids (19) bounding the memory region (22) is defined by an array of conductive elements (32) each of which is connected to the associated readout conductor (36) through a separate resistance (37).
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: August 14, 1984
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Victor Perez-Mendez, Terrence A. Mulera
  • Patent number: 4338948
    Abstract: An ultrasonic method and apparatus are provided for detecting and imaging clusters of small scattering centers in the breast wherein periodic pulses are applied to an ultrasound emitting transducer and projected into the body, thereafter being received by at least one receiving transducer positioned to receive scattering from the scattering center clusters. The signals are processed to provide an image showing cluster extent and location.
    Type: Grant
    Filed: March 27, 1980
    Date of Patent: July 13, 1982
    Assignee: Regents of the University of California
    Inventors: Victor Perez-Mendez, Frank G. Sommer