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:
Dec. 15, 1987
Filed:
Dec. 10, 1986
Applicant:
Inventors:
Masaaki Yoshida, Kanagawa, JP;
Shigeki Endo, Kanagawa, JP;
Shigeru Kisanuki, Kanagawa, JP;
Hideo Kakuzen, Kanagawa, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B / ;
U.S. Cl.
CPC ...
65157 ; 65 182 ; 65144 ; 118715 ; 118308 ;
Abstract
An apparatus is provided for the production of a porous preform of SiO.sub.2 used in the manufacture of optical fiber wherein damage to the preform caused by falling clusters of SiO.sub.2 or GeO.sub.2 formed on the wall of the deposition chamber is eliminated. In accordance with the invention, a conductive shielding member is provided inside the wall defining the deposition chamber. This shielding member eliminates an electrostatic field produced on the wall by charging, therefore preventing the adherence of fine particles thereto.