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. 01, 2015
Filed:
Jun. 13, 2012
Tadashi Enomoto, Yokohama, JP;
Iwao Okazaki, Yokohama, JP;
Takashi Yamazaki, Yokohama, JP;
Masatoshi Hayakawa, Yokohama, JP;
Tadashi Enomoto, Yokohama, JP;
Iwao Okazaki, Yokohama, JP;
Takashi Yamazaki, Yokohama, JP;
Masatoshi Hayakawa, Yokohama, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka-shi, Osaka, JP;
Abstract
The present invention provides a glass preform heating furnace in which the occurrence of arching is suppressed. The glass preform heating furnace is equipped with a susceptor (); a slit heater (); an insulator; and a furnace body, wherein, in the case that the space between the slit heater () and the susceptor or between the slit heater () and the conductive member closest to the slit heater is D, that the maximum value of the electric field in this space is E, that the number of the slits in the slit heater is N, that the slit width of the slit heater is S, and that the maximum value of the electric field in the slit space is E, the values of D, N and S are set so that E≧Eis established.