Patents by Inventor Darrell E. Emery

Darrell E. Emery 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).

  • System for determining vehicle speed and presence
    Patent number: 5455768
    Abstract: A system for monitoring ferromagnetic materials in proximity to a sensing region, which is particularly applicable to traffic monitoring and controlling. A magnetic probe generates a signal in response to magnetic flux changes caused by a vehicle moving through a sensing area. A processor analyzes the signal to determine the duration of the signal and correlates that duration to a vehicle velocity. A checking system periodically sends a checking signal to the magnetic probe and monitors the return signal to verify that the probe is operative and also analyzes the return signal to determine whether a stationary vehicles is in the sensing area.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: October 3, 1995
    Assignee: Safetran Traffic Systems, Inc.
    Inventors: Ronald P. Johnson, Daniel W. Sines, Darrell E. Emery