Patents by Inventor Otto Max Philipp

Otto Max Philipp 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).

  • Exchangeable frame for transparencies
    Patent number: 3934367
    Abstract: A re-useable frame for photographic transparencies is injection-moulded in one piece and consists of top and bottom frame members joined by connecting elements which interengage with the top frame member as the frame is closed to strengthen a hinge which is formed by interengagement of pins on one frame member with bearings on the other.
    Type: Grant
    Filed: March 21, 1974
    Date of Patent: January 27, 1976
    Inventor: Otto Max Philipp