Patents by Inventor Nils Nielsen

Nils Nielsen 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: 4063807
    Abstract: A perimetric eye examination device is provided having light-emitting diodes for the respective light sources which are perceived during the eye examinations. These light-emitting diodes are controllable for their brightness, either in linear dependence on the current, or in linear dependence on the pulse width repetition ratio of current pulses supplied to the light-emitting diode. The brightness perceived from the respective light-emitting diodes on the surface of the perimetric eye examination device also may be varied in accordance with physiological characteristics of the eye wherein the light-emitting diodes are distributed on the surface of the device with the brightness increasing from the central area of the observation area toward the periphery of the observation area.
    Type: Grant
    Filed: February 20, 1976
    Date of Patent: December 20, 1977
    Assignee: Optische Werke G. Rodenstock
    Inventors: Siegfried Gelius, Hanne-Lore Wieczorek, Adolf Triller, Nils Nielsen