Patents by Inventor Sven Torbjorn Lagerwall

Sven Torbjorn Lagerwall 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).

  • Liquid crystal devices using a linear electro-optic effect
    Patent number: 6130731
    Abstract: A device for influencing light has a polarizer, a ferroelectric or electroclinic response type liquid crystal halfwave plate whose liquid crystals are in the smectic phase with bookshelf geometry and have molecular axes which are rotatable around a first direction corresponding to the direction of incoming light in response to an electric field applied across the electrodes on either side of the halfwave plate, a quarter wave retarder plate, and a mirror. The polarizer, plates and mirror are arranged such that incoming light is passed from the polarizer through the liquid crystal plate and the retarder plate, and is reflected by the mirror in a second direction opposite to the first direction back through the retarder and the liquid crystal plate so as to provide a reflected polarized light plane to the polarizer.
    Type: Grant
    Filed: May 16, 1997
    Date of Patent: October 10, 2000
    Assignee: S.T. Lagerwall S.A.R.L.
    Inventors: Gunnar Andersson, Ingolf Dahl, Lachezar Komitov, Sven Torbjorn Lagerwall, Kent Skarp, Bengt Stebler
  • Liquid crystal devices using a linear electro-optic effect
    Patent number: 5847790
    Abstract: A device for influencing light has a polarizer, a ferroelectric or electroclinic response type liquid crystal halfwave plate whose liquid crystals are in the smectic phase with bookshelf geometry and have molecular axes which are rotatable around a first direction corresponding to the direction of incoming light in response to an electric field applied across the electrodes on either side of the halfwave plate, a quarter wave retarder plate, and a mirror. The polarizer, plates and mirror are arranged such that incoming light is passed from the polarizer through the liquid crystal plate and the retarder plate, and is reflected by the mirror in a second direction opposite to the first direction back through the retarder and the liquid crystal plate so as to provide a reflected polarized light plane to the polarizer.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 8, 1998
    Assignee: S.T. Lagerwall S.A.R.L.
    Inventors: Gunnar Andersson, Ingolf Dahl, Lachezar Komitov, Sven Torbjorn Lagerwall, Kent Skarp, Bengt Stebler