Patents by Inventor William Leo Holstein

William Leo Holstein 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).

  • Annealed carbon soot field emitters and field emitter cathodes made therefrom
    Patent number: 6310431
    Abstract: Annealed carbon soot is useful as an electron field emitter. Field emitting cathodes made up of annealed carbon soot attached to the surface of a substrate are also provided. The field emitters and field emitter cathodes are useful in vacuum electronic devices, flat panel computer and television displays, emission gate amplifiers, klystrons and lighting devices.
    Type: Grant
    Filed: May 12, 1998
    Date of Patent: October 30, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Graciela Beatriz Blanchet-Fincher, William Leo Holstein, Syed Ismat Ullah Shah, Shekhar Subramoney
  • Carbon cone and carbon whisker field emitters
    Patent number: 6020677
    Abstract: Carbon cone and carbon whisker field emitters are disclosed. These field emitters find particular usefulness in field emitter cathodes and display panels utilizing said cathodes. The carbon cone and carbon whisker field emitters can be formed by ion beam bombardment (e.g., ion beam etching) of carbon materials (e.g., bulk carbon, carbon films or carbon fibers).
    Type: Grant
    Filed: November 13, 1996
    Date of Patent: February 1, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Graciela Beatriz Blanchet-Fincher, William Leo Holstein, Syed Ismat Ullah Shah
  • Process for making a field emitter cathode using a particulate field emitter material
    Patent number: 5948465
    Abstract: A process for making a field emitter cathode is disclosed, which comprises the steps of depositing a solution of a metal compound in a solvent and an electron emitting powder onto the surface of a substrate and heating the substrate containing the solution and the electron emitting powder deposited thereon for a time and temperature sufficient for the metal compound to be completely reduced to a metal.
    Type: Grant
    Filed: May 12, 1998
    Date of Patent: September 7, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Graciela Beatriz Blanchet-Fincher, William Leo Holstein, Shekhar Subramoney, Norman Herron