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:
Jun. 01, 1993
Filed:
Dec. 24, 1991
Yoshihiro Kodama, Nishigo, JP;
Tetsuya Ishidaira, Nishigo, JP;
Koji Kanno, Shirakawa, JP;
Shin-ichi Furuse, Nishigo, JP;
Shin-Etsu Handotai Co. Ltd., Tokyo, JP;
Abstract
This is a new method for pulling a silicon single crystal. When the silicon single crystal is pulled from a quartz crucible which is provided with a rotation rate more than zero, exclusive of zero rpm according to the Czochralski process, a reference rotation rate of the quartz crucible is controlled by a predetermined program. This method is characterized in that a pulse-like increase or decrease in a rotation rate is superimposed to the reference rotation rate and differences in and cycles of the rotation rate are set by the predetermined program.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile