Patents by Inventor Hans R. Malm

Hans R. Malm 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: 4075757
    Abstract: In a process for the production of a multilayer printed board built up by starting from a desired number of insulating bases clad on both sides with an unpatterned metal layer, the improvement consisting in that the metal layers, whereout conductive patterns are to be etched and which layers are to be hidden inside the finished multilayer printed board, are coated with a plating resist in the shape of a negative of the desired conductive pattern, that the remaining visible parts of the metal layers, which are to form the conductive patterns, are coated by electroplating with a thin, rough, adhesion-promoting metal layer comprising copper, zinc, nickel, tin or any one of their alloys, that an etch resist layer of nickel, tin or any one of their alloys is electroplated on top of the adhesion-promoting layer, if the latter consists of copper, zinc or any one of their alloys, that the negative plating resist is removed, that the parts of the metal layers thus uncovered are etched away and that the insulating base
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: February 28, 1978
    Assignee: Perstorp AB
    Inventors: Hans R. Malm, Peter J. Nilsson, Jiri K. Konicek
  • 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