Patent ID: 8191308

Claim:
A chemical shell for insertion into a tree comprising: an elongated, hollow tubular body member having a closed outer end and an open inner end with a rim portion extending transversely outwardly from said hollow tubular body member at said closed outer end thereof whereby said rim portion has a greater diameter than said tubular body member; said tubular body member and said rim portion being comprised of a metal material; said hollow tubular body member having continuous, constant diameter cylindrical inner and outer wall surfaces extending from said rim portion to said open inner end thereof; a non-aqueous chemical in said tubular body member; a hollow, water soluble tubular sleeve having a closed inner end, an open outer end, and continuous, constant diameter cylindrical inner and outer wall surfaces extending from said closed inner end to said open outer end thereof; said tubular sleeve embracing and receiving said tubular body member therein so that said inner wall surface of said tubular sleeve is positioned closely adjacent said outer wall surface of said tubular body member and so that said closed inner end of said tubular sleeve closes said open inner end of said tubular body member to maintain said chemical in said tubular body member until said inner end of said tubular body member, having said tubular sleeve positioned thereon, has been driven into the tree whereby the sap in the tree will dissolve said inner end of said tubular sleeve thereby permitting the chemical in said tubular body member to be released into the tree only through said open inner end of said tubular body member.