Pressure impregnation of wood poles for preservation
AssigneeBell Canada
InventorWilliam P. Trumble
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Abstract
A treatment for wood poles, as used for telecommunications and electric power poles, to reduce surface hardening comprises modifying the standard treatment solution by the addition of a polymer of ethylene oxide. A surface active agent is a further possible additive, and reduction of the hexavalent chrome ion in the standard solution is a further modification.
Claims22
A method of treating wood, comprising the step of exposing wood to an aqueous solution consisting essentially of water, hexavalent chromium, copper, arsenic and polyethylene glycol.
A wood pole produced by a process comprising the step of treating a wood pole with an aqueous solution consisting essentially of water, hexavalent chromium, copper, arsenic and polyethylene glycol, said wood pole displaying at least one characteristic of improved climbability and resistance to checking.
Dependencies are inferred from the claim text.