Patents by Inventor Ann M. Stewart

Ann M. Stewart 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).

  • Advancement of film strips of different widths and/or sprocket hole sizes
    Patent number: 3972606
    Abstract: A rotary sprocket disc for driving motion picture film is characterized in its construction by sprocket teeth enabling interchangeable transporting of film strips of different dimensions. Certain teeth are so disposed around the sprocket disc that they will mesh with or engage the holes in different film strips, the latter having different strip widths, tooth hole sizes, and pitches.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: August 3, 1976
    Inventors: Wilton A. Stewart, Ann M. Stewart