Patents by Inventor Stephen E. Sampayan

Stephen E. Sampayan 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: 5821705
    Abstract: A dielectric-wall linear accelerator is improved by a high-voltage, fast rise-time switch that includes a pair of electrodes between which are laminated alternating layers of isolated conductors and insulators. A high voltage is placed between the electrodes sufficient to stress the voltage breakdown of the insulator on command. A light trigger, such as a laser, is focused along at least one line along the edge surface of the laminated alternating layers of isolated conductors and insulators extending between the electrodes. The laser is energized to initiate a surface breakdown by a fluence of photons, thus causing the electrical switch to close very promptly. Such insulators and lasers are incorporated in a dielectric wall linear accelerator with Blumlein modules, and phasing is controlled by adjusting the length of fiber optic cables that carry the laser light to the insulator surface.
    Type: Grant
    Filed: June 25, 1996
    Date of Patent: October 13, 1998
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: George J. Caporaso, Stephen E. Sampayan, Hugh C. Kirbie
  • Patent number: 5811944
    Abstract: A dielectric-wall linear accelerator is enhanced by a high-voltage, fast e-time switch that includes a pair of electrodes between which are laminated alternating layers of isolated conductors and insulators. A high voltage is placed between the electrodes sufficient to stress the voltage breakdown of the insulator on command. A light trigger, such as a laser, is focused along at least one line along the edge surface of the laminated alternating layers of isolated conductors and insulators extending between the electrodes. The laser is energized to initiate a surface breakdown by a fluence of photons, thus causing the electrical switch to close very promptly. Such insulators and lasers are incorporated in a dielectric wall linear accelerator with Blumlein modules, and phasing is controlled by adjusting the length of fiber optic cables that carry the laser light to the insulator surface.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: September 22, 1998
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Stephen E. Sampayan, George J. Caporaso, Hugh C. Kirbie
  • Patent number: 5723954
    Abstract: A hybrid emitter exploits the electric field created by a rapidly depoled ferroelectric material. Combining the emission properties of a planar thin film diamond emitter with a ferroelectric alleviates the present technological problems associated with both types of emitters and provides a robust, extremely long life, high current density cathode of the type required by emerging microwave power generation, accelerator technology and display applications. This new hybrid emitter is easy to fabricate and not susceptible to the same failures which plague microstructure field emitter technology. Local electrode geometries and electric field are determined independently from those for optimum transport and brightness preservation. Due to the large amount of surface charge created on the ferroelectric, the emitted electrons have significant energy, thus eliminating the requirement for specialized phosphors in emissive flat-panel displays.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: March 3, 1998
    Assignee: The Regents of the University of California
    Inventor: Stephen E. Sampayan
  • Patent number: 5508590
    Abstract: A device which can produce a bright, raster scanned or non-raster scanned image from a flat panel. Unlike many flat panel technologies, this device does not require ambient light or auxiliary illumination for viewing the image. Rather, this device relies on electrons emitted from a ferroelectric emitter impinging on a phosphor. This device takes advantage of a new electron emitter technology which emits electrons with significant kinetic energy and beam current density.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: April 16, 1996
    Assignee: The Regents of the University of California
    Inventors: Stephen E. Sampayan, William J. Orvis, George J. Caporaso, Ted F. Wieskamp
  • Patent number: 5347209
    Abstract: A method and apparatus for predict-ahead pulse-to-pulse voltage control in a pulsed power supply system is disclosed. A DC power supply network is coupled to a resonant charging network via a first switch. The resonant charging network is coupled at a node to a storage capacitor. An output load is coupled to the storage capacitor via a second switch. A de-Q-ing network is coupled to the resonant charging network via a third switch. The trigger for the third switch is a derived function of the initial voltage of the power supply network, the initial voltage of the storage capacitor, and the present voltage of the storage capacitor. A first trigger closes the first switch and charges the capacitor. The third trigger is asserted according to the derived function to close the third switch. When the third switch is closed, the first switch opens and voltage on the node is regulated. The second trigger may be thereafter asserted to discharge the capacitor into the output load.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: September 13, 1994
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Anthony N. Payne, James A. Watson, Stephen E. Sampayan
  • Patent number: 4891525
    Abstract: An ion source of the side extraction type which includes auxiliary electrodes surrounding the cathode at the ends of the anode, and insulators surrounding the auxiliary electrodes and electrically isolating them from the anode. The auxiliary electrodes essentially define the ends of the discharge chamber, leaving the anode confined to the cylindrical surface surrounding the filament. Each insulator is made up of an inner insulator and an outer insulator with an annular space defined between them. The inner and outer insulators are each in the form of a cylinder with a radially extending flange formed at one end, and interfit with the anode and with each other such that cylindrical spaces are defined between the outer flange portion and the anode and between the inner and outer flange portions. These and other features contribute to improve the electrical isolation between the auxiliary electrode and the anode, prolong source life, and improve beam purity.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: January 2, 1990
    Assignee: Eaton Corporation
    Inventors: Larry E. Frisa, Monroe L. King, Stephen E. Sampayan
  • Patent number: 4760262
    Abstract: An ion source (10) of the side-extraction hot cathode type in which the inherent drift of electrons toward the positive side of the cathode is minimized by the addition of auxiliary electrodes (31, 32) which surround the cathode (14) at the ends of the anode (12). The electrodes are electrically isolated from the cathode and anode, and various means are provided to apply a potentials to the electrodes, including interconnecting the electrodes, cross-connecting the electrodes to opposite ends of the cathode, and biasing the electrodes at fixed potentials with respect to the cathode, anode or ground.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: July 26, 1988
    Assignee: Eaton Corporation
    Inventors: Stephen E. Sampayan, Monroe L. King, Robert A. Moore