Patents by Inventor Kenneth David Fisch

Kenneth David Fisch 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).

  • Battery saving switching mechanism
    Patent number: 5804891
    Abstract: An intelligent switching mechanism for the backup batteries of an alarm system is disclosed. When AC input power has failed but no alarm has been declared, the batteries are switched into a parallel configuration, which is sufficient to supply the control panel, so that the batteries are drained in tandem. When AC input power has failed and an alarm has been declared, the batteries are switched into a series configuration to supply power at the higher voltage required by the alarm annunciators.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: September 8, 1998
    Assignee: Sentrol, Inc.
    Inventors: Douglas H. Marman, Kenneth David Fisch, Brian B. Walch