Fire-resistant composite wood structure particularly adapted for use in fire doors
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United States of America Patent
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May 20, 1980
Issued Date -
N/A
app pub date -
Aug 4, 1978
filing date -
May 26, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composite wood material, specially adapted for use as part of a door with a long fire rating, comprising a board material made of wood chips and fire-retardant chemicals and one or more sheets of material of pressed wood fibers with a fire retardant added thereto, designed to optimize resistance to penetration by fire, increase screw holding ability, resist splitting and minimize cost.
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