Patents by Inventor Ake Engstrom

Ake Engstrom 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).

  • Contact arrangement
    Patent number: 4642427
    Abstract: A switch for use in a printed circuit board having printed circuits on a surface (1a) thereof. One or several contact rollers (6, 7, 8) are adapted in a slider (4) for movement relative to the surface (1a) in such a way that the rollers interact with the printed circuit strips for closing and interrupting electrical circuitry connected to the printed circuit strips in dependence of the position of the slider.
    Type: Grant
    Filed: July 16, 1985
    Date of Patent: February 10, 1987
    Assignee: Televerkets Huvudrontor
    Inventors: Christer Kratz, Ake Engstrom, Goran Karlsson