Patents by Inventor Kjell A. Cederberg

Kjell A. Cederberg 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).

  • Method for the production of through holes in a laminate
    Patent number: 4023998
    Abstract: A method for the production of through holes in a laminate comprising an insulating base provided with a thin metal layer on at least one side, said laminate being intended for printed wiring. The method is characterized in that the thin metal layer is provided with a firmly adhering and protective foil or layer of a material being chemically different from the thin metal layer and that so-called burrs in the thin metal layer obtained during a mechanical machining of the holes are removed by dissolution whereupon the protective foil or layer can be removed.
    Type: Grant
    Filed: August 26, 1975
    Date of Patent: May 17, 1977
    Assignee: Perstorp AB
    Inventors: Kjell A. Cederberg, Jiri K. Konicek, Hans R. Malm