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:
Apr. 25, 2000
Filed:
Mar. 27, 1998
Seung-Hun Oh, Kyongsangbuk-do, KR;
Ki-Un Namkoong, Taegukwangyok-shi, KR;
Man-Seok Seo, Kyonggi-do, KR;
Un-Chul Paek, Kwangjukwangyok-shi, KR;
Kyung-Hwan Oh, Seoul, KR;
Ghie-Hugh Song, Seoul, KR;
Mun-Hyun Do, Kyongsangbuk-do, KR;
Young-Joo Chung, Kwangjukwangyok-shi, KR;
SamSung Electroncs Co., Ltd., Kyungki-do, KR;
Abstract
There are provided an optical fiber rod overcladding apparatus and method, and an optical fiber drawing method. In the preform rod overcladding method, a preform rod is clamped in a top chuck and leveled, and a glass tube is mounted in a bottom chuck and leveled. The preform rod is coaxially inserted into a glass tube. Then, the glass tube is preheated by the furnace and heated by the burner until the glass tube reaches a softening point. The preform rod is completely sealed in the glass tube by sucking air in a clearance between the preform rod and the glass tube by application of a negative vacuum pressure. Thus, a preform is completed.