Patents by Inventor Michael H. Twedell

Michael H. Twedell 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).

  • Patent number: 4842093
    Abstract: A system and method for preventing unauthorized starting of a motor vehicle. A timing interval of preselected duration is generated only upon detecting positioning of an ignition switch to a first position by means of a proper key inserted into the vehicle ignition switch. An electrical indication is generated when the ignition switch is positioned to a second position which, in one embodiment, corresponds to a start position of an automobile ignition switch. A starting circuit interrupt element remains in or is urged into a normally closed state to electrically complete the starting circuit only when the electrical indication appears during the time interval. The starting circuit may thereby only be energized for starting the motor during a normal preselected starting sequence comprised of key insertion followed by positioning of the switch from the first to the second state within the preselected time interval.
    Type: Grant
    Filed: April 19, 1988
    Date of Patent: June 27, 1989
    Inventors: Nolan C. Lerche, Edward A. Fletcher, Michael H. Twedell