Patent ID: 7178263

Claim:
A method of manufacturing incombustible wood, comprising the sequential steps of: (1) drying wood; (2) decompressing the wood in a decompression vessel; (3) immersing the wood in an incombustibility treatment agent in the decompression vessel to impregnate tissues of the wood with the incombustibility treatment agent; (4) compressing the wood while the wood is immersed in the incombustibility treatment agent in the decompression vessel to further impregnate the tissues of the wood with the incombustibility treatment agent; (5) drying the wood a second time; (6) decompressing the wood a second time in the decompression vessel; (7) immersing the wood again in the incombustibility treatment agent in the decompression vessel to again impregnate the tissues of the wood with the incombustibility treatment agent; (8) compressing the wood again while the wood is immersed in the incombustibility treatment agent in the decompression vessel to further impregnate the tissues of the wood with the incombustibility treatment agent; and (9) drying the wood a third time.