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US 6,638,574 B1Granted
Wood preservation
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorAbdul Qader
Life of this patent
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Abstract
A method of and a composition for treating wood with an insecticide. The composition comprises an insecticide such as a pyrethroid dissolved in a supercritical fluid such as carbon dioxide. The composition may also include a co-solvent such as methanol. The method includes impregnating wood with the composition and reducing the temperature and pressure below critical levels to precipitate the insecticide within the wood.
Claims20
A method of treating wood with an insecticide, comprising
- dissolving an insecticide in a supercritical fluid to form a solution of the insecticide in the supercritical fluid;
- and
- impregnating intact wood or wood products with an effective amount of the solution, wherein the insecticide is a pyrethroid.
A method of treating wood with an insecticide, comprising
- dissolving an insecticide in a supercritical fluid and a co-solvent to form a solution of the insecticide in the supercritical fluid, wherein the insecticide is a pyrethroid;
- and
- impregnating intact wood or wood products with an effective amount of the solution.
Dependencies are inferred from the claim text.