TREATMENT OF HARDWOOD ARTICLES WITH COPPER AND/OR ZINC WOOD PRESERVATIVES
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United States of America Patent
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Dec 9, 2016
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Jul 14, 2011
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Abstract
Disclosed is process of preserving hardwoods with ammoniacal copper, ammoniacal zinc or ammoniacal copper and zinc compounds. The preserved hardwoods are useable as various articles of manufacture and, in particular, railroad crossties and switch ties.
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