Patents by Inventor Lyndon Keefer

Lyndon Keefer 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).

  • High power RF precision attenuator
    Patent number: 5109204
    Abstract: A precision variable attenuator includes quadrature hybrid circuits, each having a first pair of isolated ports corresponding to the input and output ports of the attenuator. The second pair of isolated ports each are terminated with variable impedances in a manner to provide equal reflection coefficients at each port. Signals incident to the input port are coupled to the second pair of isolated ports and reflected therefrom to be coupled to the output port.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: April 28, 1992
    Assignee: Honeywell Inc.
    Inventor: Lyndon Keefer