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. 03, 2026
Filed:
Mar. 23, 2020
Ntt, Inc., Tokyo, JP;
Takuma Tsurugaya, Tokyo, JP;
Shinji Matsuo, Tokyo, JP;
Koji Takeda, Tokyo, JP;
Takuro Fujii, Tokyo, JP;
NTT, INC., Tokyo, JP;
Abstract
A difference Δ1 between an equivalent refractive index of a first reflecting section and an equivalent refractive index of a core in a first region that corresponds to the first reflecting section and a difference between an equivalent refractive index of a second reflecting section and an equivalent refractive index of the core in a second region that corresponds to the second reflecting section is set so as to be greater than a difference between an equivalent refractive index of a confining section and an equivalent refractive index of the core in a third region that corresponds to the confining section.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile