The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2003
Filed:
Oct. 26, 2000
Applicant:
Inventor:
Tomoyoshi Yabe, Aichi, JP;
Assignee:
Nichiha Corporation, Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B 3/120 ;
U.S. Cl.
CPC ...
B32B 3/120 ;
Abstract
A building board which comprises a cement substrate , a front surface coat layer formed on the front surface of the cement substrate , and a plastic sheet layer, preferably a polyethylene sheet layer formed on the back surface of the cement substrate . A plastic sheet, preferably polyethylene sheets M and F are adhered onto the rabbeted portions and , respectively, of the cement substrate . Since the rabbeted portions and are covered with polyethylene sheets M and F, the water absorption from the rabbeted portions and can be effectively prevented. and the dimensional change in the whole board can be reduced.