Patents by Inventor Bjorn S. Ellingsen

Bjorn S. Ellingsen 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: 4156120
    Abstract: A keyboard pad having a frame member 2 and at least one key 1 resiliently supported therein, the key being connected to the frame member by at least one spring element 3 for returning the depressed key to its initial position after release. The assembly is moulded in one piece from a castable, resiliently yielding material. Along at least a part of its circumference the key is surrounded by at least one elongated spring element which is rigidly connected to the key at first locations 4,5 situated substantially symmetrically about the center of the key and which is also rigidly connected to the frame member at second locations 6,7 displaced along the circumference of the key relative to the first locations and situated lower or inwardly therefrom, viewed in the depression direction of the key.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: May 22, 1979
    Inventors: Kare Vaerlien, Bjorn S. Ellingsen