Patents by Inventor Hanspeter Schad

Hanspeter Schad 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).

  • Arrangement for time-resolved optical backscatter measurement at optical waveguides
    Patent number: 4804264
    Abstract: A measuring apparatus for space-resolved temperature measurement by optical backscattering measurement at optical waveguides, wherein an improvement in the signal-to-noise ratio is achieved by including an additional filter device to attenuate the Rayleigh peak in the backscattered light. The filter device preferably includes a polarizing beam splitter, behind which a quarter-wave plate and an interference filter are disposed in the transmission direction.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: February 14, 1989
    Assignee: BBC Brown Boveri AG
    Inventors: Rolf Kirchhofer, Hanspeter Schad
  • Homeotropic nematic display with internal reflector
    Patent number: 4492432
    Abstract: Nematic liquid crystal display is provided with front side polarizer (13) and homeotropic orientation in the non-field state. The nematic liquid crystal (6) has a negative dielectric anisotropy.The display cell has an internal reflector (11) consisting of an insulating oxide layer with built-in aluminum flakes and a front side polarizer (8, 13). This display provides a reflection display with no back lighting.
    Type: Grant
    Filed: July 14, 1981
    Date of Patent: January 8, 1985
    Assignee: BBC Brown, Boveri & Company, Limited
    Inventors: Meinolph Kaufmann, Hanspeter Schad