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:
Jan. 16, 2001
Filed:
Jul. 23, 1998
Kazutoshi Wakao, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The front surface of a semiconductor substrate is formed with a trench. An insulating film is formed on the front surface of the semiconductor substrate including the trench while the bottom of the trench is kept at a higher temperature than the surface opening of the trench. To this end, the back surface of the semiconductor substrate is kept at a higher temperature than the front surface. This is done by heating the back surface of the semiconductor substrate with a halogen lamp. Alternatively, the front surface temperature is made lower than the back surface temperature by blowing a gas for forming an insulating film against the front surface of the semiconductor substrate.