Patents by Inventor Bertil Lindgren

Bertil Lindgren 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).

  • Film cassette opener
    Patent number: 4171055
    Abstract: A film cassette opener in which a film take-up spool in the cassette is forced in its axial direction out of the cassette. The opener has two jaws clasping the sides of the cassette and an ejection bar reciprocally movable in an axial direction with respect to the cassette. One end of the bar thrusts against the film take-up spool to cause one end cover of the cassette to be thrust away forcing the take-up spool with film out of the cassette.
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: October 16, 1979
    Inventor: Bertil Lindgren