Patents by Inventor Kevin Appel

Kevin Appel 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).

  • Optical device
    Patent number: 6654169
    Abstract: An optical device (29) for rotating the polarization of a linearly polarized, broadband input beam of light (3) comprises prism means (30, 37, 43). The input beam is incident normal to a first face (31) and exits normal to a second face (47) of the prism means. The prism means comprises a light transmitting material having a plurality of totally internally reflecting surfaces (32,33,34) and one or more interfaces, the totally internally reflecting surfaces are arranged such that the polarization of the exit beam is rotated by 90° relative to the input beam, each interface comprises a pair of parallel surfaces (35, 39) separated by a gap (36), the parallel surfaces are arranged substantially to satisfy the Brewster condition such that surface reflection losses are minimized and the input and exit beams are substantially collinear.
    Type: Grant
    Filed: April 25, 2002
    Date of Patent: November 25, 2003
    Assignee: Qinetiq Limited
    Inventor: Roland Kevin Appel
  • Optical device
    Publication number: 20020181101
    Abstract: An optical device (29) for rotating the polarization of a linearly polarized, broadband input beam of light (3) comprises prism means (30, 37, 43). The input beam is incident normal to a first face (31) and exits normal to a second face (47) of the prism means. The prism means comprises a light transmitting material having a plurality of totally internally reflecting surfaces (32,33,34) and one or more interfaces, the totally internally reflecting surfaces are arranged such that the polarization of the exit beam is rotated by 90° relative to the input beam, each interface comprises a pair of parallel surfaces (35, 39) separated by a gap (36), the parallel surfaces are arranged substantially to satisfy the Brewster condition such that surface reflection losses are minimized and the input and exit beams are substantially collinear.
    Type: Application
    Filed: April 25, 2002
    Publication date: December 5, 2002
    Inventor: Roland Kevin Appel
  • Display screen with animated icon
    Patent number: D777782
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: January 31, 2017
    Assignee: Microsoft Corporation
    Inventors: Kevin Appel, Gareth Holt, Garrett Reil, George Robert Lewis-Jones, Vinay Mistry, Adam Paul Savage