Railroad 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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Apr 30, 2013
Grant Date -
N/A
app pub date -
Apr 6, 2011
filing date -
Apr 25, 2007
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Abstract
The disclosure provides a railroad tie including a core, a first sleeve encapsulating the core and a second sleeve encapsulating the first sleeve. The first sleeve includes fingers running parallel to a long axis of the core along a top surface and fingers running perpendicular to a long axis of the tie along elongated sides of the first sleeve.
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