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:
Jun. 24, 2008
Filed:
May. 02, 2005
Applicant:
Toshiyuki Nakamura, Tokyo, JP;
Inventor:
Toshiyuki Nakamura, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 21/00 (2006.01);
U.S. Cl.
CPC ...
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.