Patents by Inventor Karl-Erik Frosberg

Karl-Erik Frosberg 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).

  • Guide bar including stump treatment
    Patent number: 6397452
    Abstract: A guide bar for the treatment of tree stumps. A channel formed in the bar length is fitted with a soft metal tube. The tube is pierced with a piercing tool that produces hole forms leaving a center opening inset toward the tube center with flared sides that allow spreading of the liquid treatment directed from the tube interior to a stump surface while severing a tree. The opening may be varied in size to accommodate different pivotal speed rates of the hole form locations along the bar length.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: June 4, 2002
    Assignee: Blount, Inc.
    Inventors: Karl-Erik Frosberg, Karl-Olov Pettersson