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. 14, 1999
Filed:
May. 19, 1997
Kazuo Hata, Himeji, JP;
Norikazu Aikawa, Himeji, JP;
Hideki Imai, Hyogo, JP;
Tetuya Yasaka, Suita, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
Disclosed are a ceramics sheet which has an area of 400 cm.sup.2 or more, thickness of 0.4 mm or less, maximum waviness height of 100 .mu.m or less, and warp of 0.1% or less and in which frequency of generated cracking and breakage is 10% or less when a load-applying test and a deflection-loading test each described in the text are carried out in succession, and a flat and large ceramics sheet having an area of 600 cm.sup.2 or more and thickness of 1 mm or less. Further, disclosed is a method for producing a ceramics sheet having the characteristics described above and characterized in that in calcining a ceramics green sheet to produce a ceramics sheet, the green sheet described above is interposed between porous sheets which have bulk density corresponding to 30 to 85% of the theoretical density and in which the shrinkage rate caused by heating up to the calcining temperature of the above green sheet is 5% or less on condition that the periphery of the green sheet does not protrude from the porous sheets, and calcined.