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:
Mar. 04, 2003
Filed:
May. 22, 2000
Tomoyoshi Yamashita, Hiroshima, JP;
Haruko Miyauchi, Hiroshima, JP;
Yasushi Kawaharada, Hiroshima, JP;
Kazuki Nakamura, Hiroshima, JP;
Norizi Oishi, Kanagawa, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, US;
Abstract
Disclosed is a graded index type optical fiber having a multilayer structure comprising a plurality of concentrically arranged non-blended layers LNB to LNBm formed of (co)polymers P to Pm selected from the group consisting of two or more homopolymers HP HP . . . and HPn composed of units of vinyl monomers M M . . . and Mn, respectively (provided that the refractive indices of the homopolymers decrease in that order), and one or more binary copolymers CPs composed of units of vinyl monomers M M . . . and Mn, each of (co)polymers P to Pm having a glass transition temperature (Tg) of 80° C. or above, wherein the refractive index is highest at the center of the multilayer structure and decreases gradually toward the outer periphery thereof. This optical fiber has a small transmission loss, a large numerical aperture, and excellent resistance to moist heat.