Title: Fire-resistant composite wood structure particularly adapted for use in fire doors

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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Inventors: Naslund, Edwin N. (Santa Rosa, CA, US)
MacDonald, Ian (Santa Rosa, CA, US)

Application Number: 931259
Filing Date: 1978-08-04
Publication_date: 1980-05-20
Assignee: Cal-Wood Door (Santa Rosa, CA)
Primary Class(es): 49/399 428/45, 428/326, 428/921
Other Classes:
US Patent Ref:

3535199	Oct, 1970	Kuhr	428/326.
3887415	Jun, 1975	Elmendorf	428/326.

Other Refs:
Primary Examiner: Murtagh, John E.
Assistant Examiner:
Attorney: Limbach, Limbach & Sutton