Patents by Inventor Walker C. Cottrell, Jr.

Walker C. Cottrell, Jr. 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).

  • Test system for walk-through metal detector
    Patent number: 4672837
    Abstract: Sensitivity of a walk-through metal detector is checked by providing a standard metal object simulating the mass, size and metal content of a weapon or other contraband, suspending the object in successive positions simulating where the contraband might be concealed on a person walking through the detector, and swinging the suspended object through each of said positions while operating the detector and observing its response.
    Type: Grant
    Filed: August 1, 1986
    Date of Patent: June 16, 1987
    Inventor: Walker C. Cottrell, Jr.
  • Sensitivity recalibration system for body search metal detectors
    Patent number: 4600882
    Abstract: Metal detector sensitivity is checked by holding its sensing means adjacent to a test unit containing a metal body mounted closer to one side than the other and calibrated to give a desired range of response when the sensing means moves from one of the said sides to the other.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: July 15, 1986
    Inventor: Walker C. Cottrell, Jr.