Patents by Inventor Erik Ingelstam

Erik Ingelstam 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).

  • Multifocal objective
    Patent number: 4741605
    Abstract: The present invention relates to an image-forming objective which is capable of forming sharp images of objects at at least two different distances from the objective, there being arranged at one focal plane of the objective a corrective element divided into at least two fields in which the refractive power differs between them.
    Type: Grant
    Filed: November 29, 1984
    Date of Patent: May 3, 1988
    Assignees: AB Svensk Filmindustri, Svenska Ord AB
    Inventors: Hans Alfredsson, Bo Moller, Erik Ingelstam, Per-Olof Ohlsson, Georg Vogl