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:
Nov. 05, 2002
Filed:
Sep. 29, 1999
Applicant:
Inventors:
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 3/7027 ;
U.S. Cl.
CPC ...
C03B 3/7027 ;
Abstract
A tube-shaped, GeO -doped silica glass pipe having a high refractive index is prepared (step S ), a cylindrical silica glass rod doped with F element is inserted inside the GeO -doped silica glass pipe (step S ), and the GeO -doped silica glass pipe and silica glass rod in thus inserted state are heated so as to be unified (step S ). Further, thus formed assembly is inserted inside the a pure silica glass pipe (step S ), and they are heated so as to be unified (step S ), whereby an optical fiber preform is manufactured.