Patents by Inventor Alfred Christopher Thwaites

Alfred Christopher Thwaites 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).

  • Electron gun arrangements having closely spaced cathode and electrode and a vacuum seal
    Patent number: 6614158
    Abstract: An electron gun arrangement includes a cathode having a front surface and control grid located in front of it. The control grid is mounted via a cylindrical support on a Kovar mount. The cathode is supported by a cylindrical support mounted on a Kovar support. Ceramic material being located between the two supports. The vacuum envelope within which the electron gun is contained includes the Kovar support and a flexible member with which it makes a vacuum seal, this member being of copper. The copper member is sealed to a ceramic cylinder via metal flanges. The assembly permits the spacing between the cathode and grid to be maintained while the copper member permits thermal expansion to occur to maintain vacuum integrity.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: September 2, 2003
    Assignee: EEV Limited
    Inventors: Alfred Christopher Thwaites, David Ward Carr, Steven Bardell, Peter Robert John Cox