Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Toshiyuki Nakamura0
Date of Patent
June 24, 2008
0Patent Application Number
111183610
Date Filed
May 2, 2005
0Patent Primary Examiner
Patent abstract
Laser is applied onto part on an SOS substrate using a sapphire layer to form an identifying mark. The sapphire layer on the surface of the SOS substrate, which has been exposed upon laser application, is covered with an insulating film formed by heat treatment at 700° C. or less, and thereafter a device is formed using heat treatment at a temperature higher than 700° C.
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