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:
Jul. 27, 1999
Filed:
Apr. 02, 1997
Michihiro Nakai, Sakura, JP;
Kensuke Shima, Sakura, JP;
Hiroshi Hidaka, Yotsukaidoh, JP;
Satoshi Okude, Sakura, JP;
Masaaki Sudoh, Sakura, JP;
Tetsuya Sakai, Sakura, JP;
Akira Wada, Sakura, JP;
Ryozo Yamauchi, Sakura, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
Core comprises a main stem which is formed on a substrate, linearly extending in the beam propagating direction and short branches with a certain length which extend perpendicularly to the beam propagating direction toward both sides along the plane of the substrate and are arranged at regular intervals in the beam propagating direction. Thus, the branches are arranged in a ladder geometry when it is viewed from the top, forming a rectangular waveform arrangement. The core constitutes a grating structure in which the width of the core is made to vary periodically with the branches in the beam propagating direction.