Patents Assigned to Philipp and Doris Washburn, Trustees of the Washburn Family Trust
  • Tree trunk barrier for pest control
    Patent number: 6230435
    Abstract: An apparatus and method for controlling tree pests are disclosed. The apparatus includes a band of compressible material and a barrier ring. The barrier ring is wrapped around the band of compressible material, which, in turn, is wrapped around the trunk of a tree. The barrier ring contains a recess that is filled with a substance that prevents the progression of pests onto upper levels of the tree. The method involves installing the apparatus of the invention onto the trunk of a tree.
    Type: Grant
    Filed: October 26, 1998
    Date of Patent: May 15, 2001
    Assignee: Philipp and Doris Washburn, Trustees of the Washburn Family Trust
    Inventor: Glenn E. Carman