Patents by Inventor Sriram Ramamoorthi

Sriram Ramamoorthi 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: 6703252
    Abstract: A method is disclosed for creating an emitter having a flat cathode emission surface: First a protective layer that is conductive is formed on the flat cathode emission surface. Then an electronic lens structure is created over the protective layer. Finally, the protective layer is etched to expose the flat cathode emission surface.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: March 9, 2004
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Zhizhang Chen, Paul J Benning, Sriram Ramamoorthi, Thomas Novet
  • Publication number: 20030168956
    Abstract: An emitter has an electron supply layer and a tunneling layer formed on the electron supply layer. Optionally, an insulator layer is formed on the electron supply layer and has openings defined within in which the tunneling layer is formed. A cathode layer is formed on the tunneling layer. A conductive layer is partially disposed on the cathode layer and partially on the insulator layer if present. The conductive layer defines an opening to provide a surface for energy emissions of electrons and/or photons. Preferably but optionally, the emitter is subjected to an annealing process thereby increasing the supply of electrons tunneled from the electron supply layer to the cathode layer.
    Type: Application
    Filed: March 13, 2003
    Publication date: September 11, 2003
    Inventors: Sriram Ramamoorthi, Zhizhang Chen
  • Publication number: 20030160228
    Abstract: An emitter has a rapid thermal process (RTP) formed emission layer of SiO2, SiOxNy or combinations thereof. The emission layer formed by rapid thermal processing does not require electroforming to stabilize the film. The RTP grown films are stable and exhibit uniform characteristics from device to device.
    Type: Application
    Filed: February 27, 2002
    Publication date: August 28, 2003
    Inventors: Zhizhang (John) Chen, Sriram Ramamoorthi
  • Publication number: 20030160557
    Abstract: A light device includes an electron supply defining an emitter surface. A dielectric tunneling layer is disposed between the electron supply and a cathode layer. The cathode layer has at least partial photon transparency that is substantially uniform across the emitter surface.
    Type: Application
    Filed: January 6, 2003
    Publication date: August 28, 2003
    Inventors: Zhizhang Chen, Sriram Ramamoorthi, Terry E. McMahon, Timothy F. Myers
  • Publication number: 20030143788
    Abstract: An emitter includes an electron supply and a tunneling layer disposed on the electron supply. A cathode layer is disposed on the tunneling layer. A conductive electrode has multiple layers of conductive material. The multiple layers include a protective layer disposed on the cathode layer. The conductive electrode has been etched to define an opening thereby exposing a portion of the cathode layer.
    Type: Application
    Filed: January 31, 2002
    Publication date: July 31, 2003
    Inventors: Zhizhang Chen, Paul J. Benning, Sriram Ramamoorthi, Thomas Novet
  • Publication number: 20030089900
    Abstract: An emitter has an electron supply and a porous cathode layer having nanohole openings. The emitter also has a tunneling layer disposed between the electron supply and the cathode layer.
    Type: Application
    Filed: October 1, 2002
    Publication date: May 15, 2003
    Inventors: Zhizhang Chen, Sriram Ramamoorthi, Hung Liao, Paul Benning, Alexander Govyadinov
  • Patent number: 6558968
    Abstract: An emitter has an electron supply layer and a tunneling layer formed on the electron supply layer. Optionally, an insulator layer is formed on the electron supply layer and has openings defined within in which the tunneling layer is formed. A cathode layer is formed on the tunneling layer. A conductive layer is partially disposed on the cathode layer and partially on the insulator layer if present. The conductive layer defines an opening to provide a surface for energy emissions of electrons and/or photons. Preferably but optionally, the emitter is subjected to an annealing process thereby increasing the supply of electrons tunneled from the electron supply layer to the cathode layer.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: May 6, 2003
    Assignee: Hewlett-Packard Development Company
    Inventors: Sriram Ramamoorthi, Zhizhang Chen
  • Publication number: 20030080330
    Abstract: An emitter has an electron supply layer and a tunneling layer formed on the electron supply layer. Optionally, an insulator layer is formed on the electron supply layer and has openings defined within in which the tunneling layer is formed. A cathode layer is formed on the tunneling layer. A conductive layer is partially disposed on the cathode layer and partially on the insulator layer if present. The conductive layer defines an opening to provide a surface for energy emissions of electrons and/or photons. Preferably but optionally, the emitter is subjected to an annealing process thereby increasing the supply of electrons tunneled from the electron supply layer to the cathode layer.
    Type: Application
    Filed: October 31, 2001
    Publication date: May 1, 2003
    Inventors: Sriram Ramamoorthi, Zhizhang Chen
  • Publication number: 20020190623
    Abstract: A method for creating an electron lens includes the steps of applying a polymer layer on an emitter surface of an electron emitter and then curing the polymer layer to reduce volatile content.
    Type: Application
    Filed: June 14, 2001
    Publication date: December 19, 2002
    Inventors: Zhizhang Chen, Ronald L. Enck, Sriram Ramamoorthi, Qin Liu
  • Publication number: 20020167001
    Abstract: An emitter has an electron supply layer and a tunneling layer formed on the electron supply layer. Optionally, an insulator layer is formed on the electron supply layer and has openings defined within in which the tunneling layer is formed. A cathode layer is formed on the tunneling layer to provide a surface for energy emissions of electrons and/or photons. Preferably, the emitter is subjected to an annealing process thereby increasing the supply of electrons tunneled from the electron supply layer to the cathode layer.
    Type: Application
    Filed: April 30, 2001
    Publication date: November 14, 2002
    Inventors: Zhizhang Chen, Michael J. Regan, Brian E. Bolf, Thomas Novet, Paul J. Benning, Mark Alan Johnstone, Sriram Ramamoorthi