Patents by Inventor Nicholas Mischenko

Nicholas Mischenko 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: 4198138
    Abstract: The present invention provides a system for automatically focusing a projected film image by maintaining a predetermined distance along the optical axis between the emulsion on the surface of the film and the projection lens. The system includes a movable carriage for mounting the projection lens and an electro-optic sensor mounted for movement with the carriage for maintaining the predetermined distance. The electro-optic scanner includes a light source and lens assembly for focusing a beam of light onto the surface of the film and a lens for focusing the reflected image onto a dual phototransistor receptor. A servo-amplifier is connected to the output of the dual phototransistor to provide appropriate signals to the carriage drive mechanism to maintain said predetermined distance. The servo-amplifier utilizes both positional and rate feedback to provide faster operation and settling.
    Type: Grant
    Filed: April 19, 1978
    Date of Patent: April 15, 1980
    Assignee: Bell & Howell Company
    Inventors: Robert R. Parker, Nicholas Mischenko
  • Patent number: 4018521
    Abstract: A slide projector having a supply station to accept slides from a vertical stack in a supply means, the projector having a slide separator device enabling single slide feed in a horizontal plane from an intermixed stack of thick and thin slides in the supply means.
    Type: Grant
    Filed: January 26, 1976
    Date of Patent: April 19, 1977
    Assignee: Bell & Howell Company
    Inventor: Nicholas Mischenko