Patents by Inventor Hakan E. Wikberg

Hakan E. Wikberg 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).

  • Wood preservative
    Patent number: 4737491
    Abstract: A wood perservative is disclosed which contains water, a copper and/or zinc complex or a copper and/or zinc complex together with a zirconium complex, dissolved in water, and an acid which stabilizes the said metals in wood. According to the invention there is used as the acid which stabilizes metals in wood an organic polymer which is soluble in water or forms micelles in water, contains acid groups, and penetrates wood at least partly. Phloroglucin derivatives of fern extract can be used in addition.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: April 12, 1988
    Assignee: Kemira OY
    Inventors: Sirkka L. Leppavuori, Lars H. Petander, Lauri J. Teivainen, Hakan E. Wikberg