Patents by Inventor William P. Ketcham

William P. Ketcham 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).

  • Countdown timer
    Patent number: 4451158
    Abstract: A countdown timer designed for counting down predetermined intervals of time and periodically announcing the progressive elapse of the countdown period thru the use of a voice synthesizer. The time interval between the spoken announcements is decreased as the end of the period approaches. An automatic restart period is incorporated which recycles to a predetermined time to begin the countdown again the number of the restart cycle being counted down is displayed.
    Type: Grant
    Filed: January 20, 1983
    Date of Patent: May 29, 1984
    Assignee: William P. Ketcham
    Inventors: Stephen Selwyn, William P. Ketcham
  • Countdown timer
    Patent number: D279173
    Type: Grant
    Filed: January 20, 1983
    Date of Patent: June 11, 1985
    Inventor: William P. Ketcham