Method for Fabricating Glass Preform for Optical Fiber

Sumitomo Electric Industries Ltd had filed patent application number 2610/DEL/1996 for method for fabricating glass preform for optical fiber on Nov. 28, 1996. The inventors of the patent are Shinji Ishikawa, Masumi Ito and Sumio Hoshino.

The International classification number is C03B37/01. According to the Controller General of Patents, Designs & Trade Marks, "A method of fabricating a glass preform for an optical fiber having a silica glass portion doped with fluorine by vapor phase axial deposition, comprising; a first step of introducing glass raw material gas and fluorine compound gas into oxyhydrogen flame and depositing fine glass particles in the direction of a target axis by flame hydrolysis, thereby letting a deposited body of said fine glass particles grow in said direction of the target axis; wherein a period of growth of said deposit body of the fine glass particles comprises a period during which an initial flow rate of said fluorine compound gas into said oxyhydrogen flame is montonically and linearly increased to a final flow rate of said fluorine compound gas and a second step of heating said deposited body of fine glass particles to make it transparent."

About the Company Sumitomo Electric Industries is a manufacturer of electric wire and optical fiber cables. It holds the lead in market share for electric cables within Japan. Its headquarters are in Chuo-ku, Osaka, Japan. The company's shares are listed in the first section of the Tokyo, Osaka, and Nagoya Stock Exchanges, and the Fukuoka Stock Exchange. In the period ending March 2006, the company reported consolidated sales of 2,007,134,000,000 Japanese yen.

October 28, 2011

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