Patents by Inventor Roar L. Alfheim

Roar L. Alfheim 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: 4205031
    Abstract: A method of producing laminar structures, preferably consisting of fibreglass-reinforced polyester, which are free of air-pockets and pores, by spraying layers of the plastics and reinforcement fibres at a partial vacuum. The method may be carried out by an industrial robot. An airtight surface layer may be sprayed onto the laminate, whereby any pores or air-pockets collapse when the laminate is exposed to air at atmospheric pressure.
    Type: Grant
    Filed: June 2, 1977
    Date of Patent: May 27, 1980
    Inventors: Kent R. Almqvist, Jan A. Christensen, Roar L. Alfheim, Lars Torgersen