Patents by Inventor Brian L. Engstrom

Brian L. Engstrom 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).

  • Method and apparatus for optical isolation
    Patent number: 5818626
    Abstract: An optical isolator and circular polarizer are used in combination to optically isolate specular and diffuse reflections which result when a forward traveling radiation beam encounters an optical or non-optical boundary surface. The forward traveling radiation beam is linearly polarized with a linear polarizer such that its plane of linear polarization is aligned with a first polarization axis, then the axis of linear polarization is rotated to a second polarization axis with a polarization rotator and finally the linearly polarized forward traveling beam is circularly polarized with a quarter wave retarder.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: October 6, 1998
    Assignee: Agfa Division, Bayer Corp.
    Inventors: Brian L. Engstrom, Siu-Yan B. Ng