Patents by Inventor Lynn R. Garrison

Lynn R. Garrison 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: 4581700
    Abstract: A railroad train moving along an approach to a grade crossing (or other location of interest) is detected by apparatus that is responsive to the change in effective track impedance caused by the moving shunt. A constant current AC signal is applied to the track adjacent the crossing, and the resulting voltage changed in amplitude and phase is picked off by a receiver on the opposite side of the crossing. Voltage and current information derived from these signals is inputted to a microcomputer which calculates the track impedance and determines whether or not a warning device or devices at the crossing should be activated. Such determination is made on a repetitive basis in accordance with a repeating program loop and stored in memory.
    Type: Grant
    Filed: August 6, 1984
    Date of Patent: April 8, 1986
    Assignee: SAB Harmon Industries, Inc.
    Inventors: Wilfred L. Farnham, Lynn R. Garrison, Wayne N. Wheeler, Forrest H. Ballinger
  • Patent number: 3998214
    Abstract: Premature ventricular contractions are detected by separately rectifying the high and low frequency components of the QRS portion of an ECG waveform, integrating the rectified high frequency signal and using such integral to control the gain of an AGC input circuit, and comparing such integral with the rectified low frequency signal to provide an output signal indicating the occurrence of a PVC.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: December 21, 1976
    Assignee: Brondy Laboratories, Inc.
    Inventor: Lynn R. Garrison