Patents by Inventor David B. MacDougall

David B. MacDougall 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).

  • Computing the length of a railway vehicle or a train of such vehicles
    Patent number: 5036478
    Abstract: In a railway signalling system, the length of a vehicle or train is computed by on board measurement of the distance travelled between detecting the passage of the front of the vehicle or train past a fixed point and detecting the passage of the rear of the vehicle or train past the same fixed point or a fixed point a known distance from the first.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: July 30, 1991
    Assignee: Westinghouse Brake and Signal Holdings Limited
    Inventor: David B. MacDougall