Patents by Inventor Eric M. Chang

Eric M. Chang 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).

  • Movie camera having adjustable shutter
    Patent number: 5850277
    Abstract: A shutter system for a movie camera or the like for controlling the film exposure including a main shutter wheel rotatably mounted on main drive shaft driven by a first motor and at least one adjustable shutter wheel positioned adjacent to and coaxially rotating with the main shutter wheel, the adjustable shutter wheel being mounted on a secondary shaft independently driven by a second motor. Both the aperture (determined by the relative positions of the shutter wheels of the main shutter wheel and adjustable shutter wheel) and the shutter speed are set by a controller which regulates the speed of each of the motors.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: December 15, 1998
    Assignee: Panavision, Inc.
    Inventors: Brian C. Dang, Albert K. Saiki, Eric M. Chang