Patents by Inventor Del R. Lien

Del R. Lien 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).

  • Lamp switch circuit
    Patent number: 4104540
    Abstract: A circuit and circuit elements are disclosed to operate a lamp independently from either a two-position wall-mounted switch or a two-position lamp-mounted switch.
    Type: Grant
    Filed: August 23, 1977
    Date of Patent: August 1, 1978
    Inventor: Del R. Lien