Patents by Inventor Donald Bruce Trotter

Donald Bruce Trotter 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).

  • Portable differential thermal biofeedback device
    Patent number: 6325763
    Abstract: This invention is a simple, portable differential thermal biofeedback device that can be used to measure pain, anxiety, relaxation, or the defensive reflex. It compares hand temperature with head temperature and provides feedback on a voltmeter display. It can also be used to provide either hand or head temperature feedback, controlled for ambient temperature.
    Type: Grant
    Filed: January 3, 2000
    Date of Patent: December 4, 2001
    Inventors: Kenneth Raymond Pfeiffer, Donald Bruce Trotter