Patents by Inventor Ronald H. Kirby

Ronald H. Kirby 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).

  • Fire alarm system with sensitivity adjustment
    Patent number: 5552763
    Abstract: A fire alarm system automatically adjusts sensitivity of individual sensors based on evaluation of background level over a period of time. High sensor signals which do not trigger a fire alarm may, after a delay time, result in decreased sensitivity to avoid false alarms. On the other hand, low peak values stored over a period on the order of months result in an automatic increase in sensitivity of the system. The sensitivity is adjusted by changing the delta threshold of an alarm threshold over a quiescent sensor signal average.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: September 3, 1996
    Assignee: Simplex Time Recorder Company
    Inventor: Ronald H. Kirby