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:
Sep. 05, 1989
Filed:
Feb. 20, 1987
Applicant:
Inventors:
Akihisa Kawasaki, Osaka, JP;
Toshihiro Kotani, Osaka, JP;
Ryusuke Nakai, Osaka, JP;
Shintaro Miyazawa, Isehara, JP;
Keigo Hoshikawa, Isehara, JP;
Assignees:
Sumitomo Electric Industries, Ltd., both of, JP;
Nippon Telegraph & Telephone Public Corporation, both of, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C30B / ;
U.S. Cl.
CPC ...
1566171 ; 422249 ; 1566191 ; 1566205 ; 1566203 ;
Abstract
An apparatus for pulling a single crystal by CZ method or LEC method is improved. To this end, the heater for heating the inside of the furnace is divided at least in the vicinity of the solid-liquid interface into at least two heaters. Using this apparatus, a single crystal with a decreased dislocation density can be obtained.