Patents by Inventor John M. Steward

John M. Steward 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: 4034272
    Abstract: A moving screen display device includes a display web supported on a pair of reels, and a reversible motor to drive each reel. The motors are selectively driven so that if one motor is driving one reel in a take-up direction, the other motor is driven in the same direction at a reduced voltage to relieve stress on its drive train. To stop the web at a desired display position, the driving motor is deenergized, and the other motor is simultaneously driven for a few seconds in a reverse direction at a reduced voltage to counteract the momentum of the system.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: July 5, 1977
    Inventor: John M. Steward