Patents by Inventor Inger Lindqvist

Inger Lindqvist 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: 4264158
    Abstract: A picture plate changer for changing pictures projected with a large scale picture projector, e.g., overhead type projectors projecting a single picture from an entire picture plate. A magazine stores the picture plates as a stack of flat plates or plexiglass each placed in horizontal slots or tracks in the changer. The stack of plates are vertically shiftable to selected disposition so that a desired entire picture is accurately indexed to a location just above the level of the projector plate and interconnectors on each frame selectively cooperate with a mechanism which can engage and shift a selected picture and frame from the magazine to the projector and back. Power mechanisms and control means are shown to enable selection and operation of the changer in a pre-determined manner. Devices on the changer and the picture plates assure accurate positioning for projectors.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: April 28, 1981
    Inventor: Inger Lindqvist