Polymer grid for supplemental roof and rib support of combustible underground openings
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United States of America Patent
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-
Mar 17, 1992
Grant Date -
N/A
app pub date -
Mar 27, 1991
filing date -
Mar 27, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high-strength, lightweight flame-retardant and/or self-extinguishing polymer grid is provided for supplemental support of the roof and ribs of a combustible underground opening, such as within a coal mine, to prevent roof materials from falling and/or rib materials from spalling. The preferred polymer grid structure is formed of a polypropylene compounded with flame retardant additives.
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Cited Art Landscape
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