Patents by Inventor Bjorn O. Nilsson

Bjorn O. Nilsson 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).

  • Electrically controllable optical filter device
    Patent number: 5438637
    Abstract: An electrically controllable filter device is provided which comprises an electrode structure which induces a filter for waves within a given wavelength range. The electrode structure is so formed that it within the given wavelength range acts as a filter merely upon electrical feeding whereas it in the absence of electrical feeding has no filtering effect. Furthermore, the electrode structure is so arranged that the filter depending on how the electrode structure is fed can be tuned to a number of different discrete frequencies.
    Type: Grant
    Filed: December 8, 1993
    Date of Patent: August 1, 1995
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Bjorn O. Nilsson, Pierre J. Rigole