Building boards, manufacturing apparatus and prefoamed plastics
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 24, 2004
Grant Date -
N/A
app pub date -
Jun 30, 2000
filing date -
Jun 30, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A building board comprising a cement substrate, a top coated layer formed on the front surface of the substrate, and a plastic sheet formed on the back surface of the substrate. The plastic sheet should preferably be formed of a polyethylene sheet. Since the impregnation of water from the back surface of building board can be effectively prevented, the change in dimension of board as a whole can be minimized.
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Cited Art Landscape
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