Patents by Inventor Yanping Ma

Yanping Ma 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).

  • III-nitride power device
    Publication number: 20090001424
    Abstract: A III-nitride power device that includes a Schottky electrode surrounding one of the power electrodes of the device.
    Type: Application
    Filed: June 26, 2007
    Publication date: January 1, 2009
    Inventors: Jianjun Cao, Yanping Ma, Robert Beach, Michael A. Briere
  • MOSgated device termination with guard rings under field plate
    Patent number: 6563197
    Abstract: Guard ring diffusions in the termination of a MOSgated device are laterally spaced from one another and are disposed beneath and are insulated from the termination field plate which extends from the periphery of the device active area.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: May 13, 2003
    Assignee: International Rectifier Corporation
    Inventors: Kenneth Wagers, Yanping Ma, Jianjun Cao
  • Sodium cobalt bronze batteries and a method for making same
    Patent number: 5916710
    Abstract: A solid state secondary battery utilizing a low cost, environmentally sound, sodium cobalt bronze electrode. A method is provided for producing same.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: June 29, 1999
    Assignee: The Regents of The University of California
    Inventors: Marca M. Doeff, Yanping Ma, Steven J. Visco, Lutgard DeJonghe
  • Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material
    Patent number: 5558961
    Abstract: An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M.sub.x Z.sub.y Mn.sub.(1-y) O.sub.2, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: September 24, 1996
    Assignee: Regents, University of California
    Inventors: Marca M. Doeff, Marcus Y. Peng, Yanping Ma, Steven J. Visco, Lutgard C. DeJonghe
  • Method for intercalating alkali metal ions into carbon electrodes
    Patent number: 5443601
    Abstract: A low cost, relatively flexible, carbon electrode for use in a secondary battery is described. A method is provided for producing same, including intercalating alkali metal salts such as sodium and lithium into carbon.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: August 22, 1995
    Assignee: Regents, University of California
    Inventors: Marca M. Doeff, Yanping Ma, Steven J. Visco, Lutgard DeJonghe