Patents by Inventor Hartwig Blumer

Hartwig Blumer 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: 5059466
    Abstract: A method of manufacturing chipboard having a central layer of coarse chips and two outer layers of chips whose fibers are oriented in the plane of the board. The central layer is formed by using as chips therefor end-grain cut flake-like chips, the fibers of which are oriented in the direction of thickness of the chips, so that the chip fibers in the central layer are oriented substantially transversely to the plane of the board. The chipboard thus formed has low swelling with moisture and relatively light weight for its strength. Such chipboard also has relatively high bending strength and transverse strength.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: October 22, 1991
    Assignee: Institutet for Trateknisk Forskning
    Inventor: Hartwig Blumer