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:
May. 22, 2012
Filed:
Sep. 03, 2010
Ryuichi Sugizaki, Tokyo, JP;
Naomi Kumano, Tokyo, JP;
Iwao Shimotakahara, Tokyo, JP;
Harumi Inaba, Tokyo, JP;
Takeshi Yagi, Tokyo, JP;
Tomoya Shimizu, Tsukuba, JP;
Toshio Kurashima, Tsukuba, JP;
Kazuhide Nakajima, Tsukuba, JP;
Ryuichi Sugizaki, Tokyo, JP;
Naomi Kumano, Tokyo, JP;
Iwao Shimotakahara, Tokyo, JP;
Harumi Inaba, Tokyo, JP;
Takeshi Yagi, Tokyo, JP;
Tomoya Shimizu, Tsukuba, JP;
Toshio Kurashima, Tsukuba, JP;
Kazuhide Nakajima, Tsukuba, JP;
Furukawa Electric Co., Ltd., Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An optical fiber preform manufacturing method includes: supporting a drilling jig in a radial direction of a preform that is cylinder-shaped; moving the drilling jig in a longitudinal direction of the preform; and forming a plurality of slits each extending in the longitudinal direction and each directed from an outer side of the preform toward a center the preform, and a plurality of holes each extending in the longitudinal direction and each connecting with an end of one of the plurality of slits in a depth direction of the one of the plurality of slits.