Patents by Inventor Ulf Perhson

Ulf Perhson 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).

  • Method and device for preventing or releasing a blocking caused by logs fed to a chipper through a feeding chute
    Patent number: 6164350
    Abstract: Method and apparatus for preventing or releasing a blockage occurring in a flow of tree trunks supplied to a wood chipper via a feed hopper and for securing an uninterrupted flow of timber to the chipper. At least one lifting arm is insertable to project through an opening defined in a hopper. The lifting arm is inserted to raise tree trunks wedged in the hopper and release blockages. The duration of the lifting arm insertion is controlled momentarily for limiting the amount of tree trunks supplied to the chipper.
    Type: Grant
    Filed: October 14, 1999
    Date of Patent: December 26, 2000
    Assignee: Andritz-Patentverwaltungs-GmbH
    Inventors: Anders Olofsson, Ulf Perhson