Patents by Inventor Robert B. Toth

Robert B. Toth 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).

  • Fan operating status sensing circuit
    Patent number: 4977375
    Abstract: A direct current fan's status is monitored electronically using a current monitoring circuit. Normally, when a fan is running it exhibits a pulsating current input. The resulting alternating current signal is monitored via the current monitoring circuit to detect whether the fan is running or not.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: December 11, 1990
    Assignee: Northern Telecom Limited
    Inventor: Robert B. Toth