Patents by Inventor Derek Thompson-Ashworth

Derek Thompson-Ashworth 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).

  • Glider doors
    Patent number: 4754997
    Abstract: In a glider door for use in a bus or streetcar with a step within the door, one lower corner of the door panel is cut away so as to clear the step when the door is open, and a subsidiary panel of a size to close the door panel is carried by a lower swing link supporting the door panel so as to close the cut away portion when the door is closed.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: July 5, 1988
    Assignee: Stone International PLC
    Inventor: Derek Thompson-Ashworth