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. 08, 1983
Filed:
Dec. 11, 1981
Applicant:
Inventors:
Takao Edahiro, Ibaraki, JP;
Tetsuo Miyajiri, Kanagawa, JP;
Hiroshi Yokota, Kanagawa, JP;
Toru Kuwahara, Kanagawa, JP;
Assignees:
Nippon Telegraph & Telephone Public Corporation, Tokyo, JP;
Sumitono Electric Inds., Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03B / ; C03B / ;
U.S. Cl.
CPC ...
65-312 ; 65 182 ;
Abstract
A process for producing a porous optical fiber preform by hydrolyzing a gaseous glass forming material with a flame from an oxyhydrogen burner and depositing the resulting soot in a rod form in a muffle furnace is described, wherein the muffle furnace is supplied with a gas other than that from the oxyhydrogen burner, and said gas is maintained at a constant temperature.