Railway tie of non-homogeneous cross section useful in environments deleterious to timber
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United States of America Patent
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May 17, 2011
Grant Date -
Oct 30, 2008
app pub date -
Apr 25, 2007
filing date -
Apr 25, 2007
priority date (Note) -
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Abstract
A railroad tie comprises a core comprising wood or a wood product, and a first sleeve encapsulating the core, wherein the first sleeve comprises at least one of the group consisting of plastic, plastic-composite, or non-plastic polymers. A second sleeve may additionally encapsulate the first. In a preferred embodiment, the first sleeve is comprised primarily of poly ethylene terephthalate, and the second sleeve is comprised primarily of high density poly ethylene.
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