Patents by Inventor Marc W. Ditz

Marc W. Ditz 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).

  • Low battery indicator
    Patent number: 4622544
    Abstract: An emergency response system in which the low battery condition of a wireless help unit is automatically detected and indicated at a receiver. The help unit provides, as part of the transmitted signal, a signal indication of battery condition. The received signal is decoded and, upon detection of a low battery signal indication, a visual and/or audible output indication denotes this condition. The low battery indication at the receiver remains on until a transmission is received from the help unit when containing a fresh battery replacement.
    Type: Grant
    Filed: May 13, 1985
    Date of Patent: November 11, 1986
    Assignee: Lifeline Systems, Inc.
    Inventors: Theodore Bially, Marc W. Ditz