Patents by Inventor Marja Englund

Marja Englund 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).

  • Patent number: 5635831
    Abstract: An optical voltage/electric field sensor includes a crystal having a refractive index distribution which depends on an electric field applied thereto, wires for leading the electric field onto the surface of the crystal, a detector to detect changes in the refractive index distribution, and a transparent material having a low extinction coefficient and dielectric constant surrounding the crystal. Such a sensor is particularly useful for measuring the voltage of high frequency dryers.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: June 3, 1997
    Assignee: Imatran Voima Oy
    Inventor: Marja Englund