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:
Feb. 06, 2007
Filed:
Dec. 23, 2003
Applicant:
Masayuki Tomoyasu, Nirasaki, JP;
Inventor:
Masayuki Tomoyasu, Nirasaki, JP;
Assignee:
Tokyo Electron Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L 21/00 (2006.01); C23C 16/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An observation window airtightly installed at a wall of a processing room of a plasma processing apparatus includes a body having a through hole with an opening facing the processing room, a transparent member installed at a side of the body opposite to the processing room and a magnetic pole pair having two different magnetic poles disposed opposite each other with the hole interposed therebetween. The magnetic pole pair is configured to have a sufficient magnetic field strength to prevent electrons which form a plasma in the processing room from reaching the transparent member through the hole.