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:
Apr. 24, 2001
Filed:
Jun. 01, 1998
Applicant:
Inventors:
Waichi Yamamura, Annaka, JP;
Tadakatsu Shimada, Annaka, JP;
Hideo Hirasawa, Annaka, JP;
Soichiro Kemmochi, Tokyo, JP;
Assignee:
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 3/707 ;
U.S. Cl.
CPC ...
C03B 3/707 ;
Abstract
A method for drawing a glass ingot comprises holding a vertically suspended glass ingot,at an upper end thereof, passing the ingot through a heating furnace,having upper and lower openings, and drawing the glass ingot while moving one end or both ends thereof, wherein a plurality of heating means,are provided along vertical directions in the heating furnace,, and the temperatures of the respective heating means,are individually control to control a temperature distribution within the heating furnace