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:
May. 18, 2010
Filed:
Mar. 08, 2007
Applicants:
Etsurou Morita, Tokyo, JP;
Kazuo Hujie, Tokyo, JP;
Isoroku Ono, Tokyo, JP;
Inventors:
Assignee:
Sumco Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 21/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
A bonded wafer is produced by bonding an ion-implanted wafer for an active layer onto a wafer for a supporting substrate, and thereafter exfoliating the wafer for the active layer at the ion-implanted position through a heat treatment and then polishing a terrace portion of the resulting active layer with a predetermined fixed grain abrasive cloth to remove island-shaped projections on the terrace portion while controlling a scattering of terrace width and smoothness of an outer peripheral face of the active layer.