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:
Aug. 10, 1999
Filed:
Apr. 15, 1998
Koichi Shimomura, Kanagawa, JP;
Yoshinobu Hiraishi, Kanagawa, JP;
Mitsunori Kawabata, Kanagawa, JP;
Kentaro Nakamura, Kanagawa, JP;
Komatsu Electronic Metals Co., Ltd., Kanagawa, JP;
Abstract
In the process of forming-the shoulder in which the diameter of a crystal is gradually extended from a small seed crystal to a predetermined value, the largest width of a bright ring, which is formed in a boundary between the melt and the crystal pulled up from the melt, is measured, and an arc width of an arbitrary portion of the bright ring located before the largest width portion is measured. When the largest width of the bright ring has reached a predetermined value, a measured value of the arc width at the arbitrary position of the bright ring is used as a reference value, and after that, automatic control is conducted so that the measured value of the arc width can be close to the reference value.