Patents by Inventor Jeff L. Krichmar

Jeff L. Krichmar 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).

  • Pupil detection system
    Patent number: 5610673
    Abstract: A pupil detection system projects two small infrared (IR) spots separated by approximately 0.5 mm. Each spot is turned on at different times (or alternatively, they can be modulated at different frequencies). The error signal produced by each spot is compared. If the errors are similar, a pupil is present. If the errors are different, no pupil is present (i.e., a blink or lost tracking). The sequencing of the IR spots and the reading of the detector data occur at the higher rates needed for accurate eye tracking.
    Type: Grant
    Filed: September 14, 1995
    Date of Patent: March 11, 1997
    Assignee: Pulse Medical Instruments, Inc.
    Inventors: Marc D. Rafal, Eric Starin, Jeff L. Krichmar