Patents by Inventor Frank P. Andrews

Frank P. Andrews 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).

  • Radar altimeter systems
    Patent number: 4894659
    Abstract: An aircraft microwave altimeter system has a threshold detector with two parallel channels that provide two sets of output signals at two different levels of sensitivity. The signals at the higher sensitivity are supplied to a display whereas those at the lower sensitivity are supplied to a navigation system. A comparator indicates a fault in the system if the two sets of output signals differ by more than a predetermined amount.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: January 16, 1990
    Assignee: Smiths Industries Public Limited Company
    Inventor: Frank P. Andrews
  • Microstrip devices
    Patent number: 4706050
    Abstract: A microstrip antenna or other microstrip device has a planar electrically-conductive region on the surface of a dielectric board. The device is tuned by silk-screen printing one or more layers of a dielectric ink/paint over the surface of the device. This produces layers of a predetermined thickness which each reduce the frequency of tuning of the device by a predetermined amount until the desired frequency is achieved.
    Type: Grant
    Filed: September 4, 1985
    Date of Patent: November 10, 1987
    Assignee: Smiths Industries Public Limited Company
    Inventor: Frank P. Andrews