Patents by Inventor Siu Kee Lee

Siu Kee Lee 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).

  • Automatic gain control for transducer circuit
    Patent number: 3999133
    Abstract: A circuit for controlling the gain of a transducer circuit by detecting the peak voltage of the transducer circuit, comparing the voltage with the reference voltage and modifying the output of the transducer circuit in a direction to adjust the output voltage towards a desired voltage.
    Type: Grant
    Filed: January 16, 1976
    Date of Patent: December 21, 1976
    Assignee: Sperry Rand Corporation
    Inventors: Siu Kee Lee, John Cuda