Patents by Inventor Roelof Terwel

Roelof Terwel 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).

  • Laminated identity card and a method for the manufacture thereof
    Patent number: 5135263
    Abstract: The invention relates to a laminated identity card, comprising a photographic emulsion layer intended for identity information which is adhered on both sides to a covering layer and to a method for the manufacture of this laminated identity card, comprising the steps for: a) the provision of a photographic emulsion layer intended for identity information; b) the adhesion of a first covering layer to the one surface of the photographic emulsion layer; and c) the adhesion of a second covering layer to the other surface of the photographic emulsion layer.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: August 4, 1992
    Assignee: Sallmetall B.V.
    Inventor: Roelof Terwel
  • Method and device for cutting a sandwich panel
    Patent number: 4984615
    Abstract: A method and device for making a completely smooth cut in a sandwich panel constructed of a core having two relatively thin and mechanically resistant skin plates adhered thereto on both sides. The disclosed method using the steps of cutting a channel in at least one of the skin plates and cutting the core with another blade through the previously cut channel.
    Type: Grant
    Filed: August 1, 1989
    Date of Patent: January 15, 1991
    Assignee: 501 Sallmetall BV
    Inventor: Roelof Terwel