Patents by Inventor Charles E. Riehm, Jr.

Charles E. Riehm, Jr. 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).

  • Single polarity circuit
    Patent number: 4319144
    Abstract: A circuit with low impedance for maintaining a single polarity at an output is disclosed. Switching is provided by light controlled switching devices which in one embodiment are field effect transistors (14, 15, 16, 17) which are optically triggered by one or more photo-responsive devices (26', 27', 28', 29') coupled to their gate electrodes. The ON-OFF state of each switch is determined by the presence or absence of light from an adjacent line-powered LED (26, 27, 28, 29). A diode (32, 33, 34, 35) may be included in parallel with each switching device to provide surge protection.
    Type: Grant
    Filed: May 22, 1980
    Date of Patent: March 9, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: William C. King, Dennis J. Lynes, Charles E. Riehm, Jr., Sigurd G. Waaben