Patents by Inventor Theodorus H. M. Stevens

Theodorus H. M. Stevens 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).

  • Apparatus for depositing cathode material on a wire cathode
    Patent number: 5902464
    Abstract: A method and apparatus for depositing emitter material (3) on a wire cathode by means of electrodeposition. An amount (13) of a suspension comprising an alkaline-earth compound is transferred by a drop holder (11) which is positioned around the wire (2), by movement in a direction transverse to a longitudinal axis of the wire (2), whereafter an electric voltage is applied to the drop holder (11) and the wire (2) to deposit the emitter material (3) on the wire (2), after which the drop holder (11) is withdrawn from the wire (2) again. During the electrodeposition process the drop holder (11) and the wire (2) can be moved with respect to each other along sections of the wire (2) where the emitter material (3) has to be deposited.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: May 11, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Nicolaas J. M. Van Leth, Godefridus J. Verhoeckx, Theodorus H. M. Stevens
  • Method for depositing cathode material on a wire cathode
    Patent number: 5714051
    Abstract: A method and apparatus for depositing emitter material (3) on a wire cathode by means of electrodeposition. An amount (13) of a suspension comprising an alkaline-earth compound is transferred by a drop holder (11) which is positioned around the wire (2), by movement in a direction transverse to a longitudinal axis of the wire (2), whereafter an electric voltage is applied to the drop holder (11) and the wire (2) to deposit the emitter material (3) on the wire (2), after which the drop holder (11) is withdrawn from the wire (2) again. During the electrodeposition process the drop holder (11) and the wire (2) can be moved with respect to each other along sections of the wire (2) where the emitter material (3) has to be deposited.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: February 3, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Nicolaas J.M. Van Leth, Godefridus J. Verhoeckx, Theodorus H.M. Stevens
  • Vacuum tube comprising a ceramic element and a method of interconnecting a ceramic element and a conductive element
    Patent number: 5573173
    Abstract: Vacuum tube comprises a ceramic element and method of interconnecting a ceramic element and a conductive element. A conductive connection consisting of a first layer containing silver and a filler and a second layer containing silver, gold or copper is formed between the ceramic element and the conductive element. The two above-mentioned layers are bonded together by means of diffusion bonding.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 12, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Ronald van der Wilk, Theodorus H. M. Stevens, Josephus J. van Moorsel
  • Vacuum tube comprising a ceramic element and a method of interconnecting a ceramic element and a conductive element
    Patent number: 5479067
    Abstract: A vacuum tube includes a ceramic element and a conductive element. A conductive connection consisting of a first layer containing silver and a filler and a second layer containing silver, gold or copper is formed between the ceramic element and the conductive element. The two above-mentioned layers are bonded together by means of diffusion bonding.
    Type: Grant
    Filed: November 1, 1993
    Date of Patent: December 26, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Ronald van der Wilk, Theodorus H. M. Stevens, Josephus J. van Moorsel