Patents by Inventor Lewis Steer

Lewis Steer 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).

  • Thermal compensation arrangement for microwave filter
    Patent number: 6420947
    Abstract: This invention discloses an improved thermal compensation arrangement for a microwave filter of the type comprising at least one cavity defined by a metal side wall having a low coefficient of thermal expansion, such as invar, and lightweight metal end walls, such as aluminum, having good thermal and electrical conductivity, but a high coefficient of thermal expansion. The present invention comprises a characteristic arrangement of annular grooves and slots in the end walls that mechanically isolate the end walls from the side wall fixed thereto, to avoid distortion of the cavity with changes in temperature.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: July 16, 2002
    Assignee: Alcatel
    Inventors: Graham Broad, Lewis Steer
  • Thermal compensation arrangement for microwave filter
    Publication number: 20010026201
    Abstract: This invention discloses an improved thermal compensation arrangement for a microwave filter of the type comprising at least one cavity defined by a metal side wall having a low coefficient of thermal expansion, such as invar, and lightweight metal end walls, such as aluminium, having good thermal and electrical conductivity, but a high coefficient of thermal expansion. The present invention comprises a characteristic arrangement of annular grooves and slots in the end walls that mechanically isolate the end walls from the side wall fixed thereto, to avoid distortion of the cavity with changes in temperature.
    Type: Application
    Filed: March 26, 2001
    Publication date: October 4, 2001
    Inventors: Graham Broad, Lewis Steer