Patents by Inventor Christopher R. Kline

Christopher R. Kline 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).

  • Ringer system for a telephone
    Patent number: 4374307
    Abstract: A telephone ringer system is disclosed which uses an oscillator circuit to drive a piezoelectric transducer to produce the ring signal.
    Type: Grant
    Filed: August 29, 1980
    Date of Patent: February 15, 1983
    Assignee: Tandy Corporation
    Inventors: Peter H. Haagen, Christopher R. Kline