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:
Jun. 09, 2026
Filed:
May. 11, 2022
Sumitomo Electric Industries, Ltd., Osaka, JP;
Noboru Ueda, Osaka, JP;
Youji Nakai, Osaka, JP;
Katsuhito Oshima, Osaka, JP;
Yoshiyuki Matsubara, Osaka, JP;
Motonobu Nishino, Osaka, JP;
Masashi Oikawa, Osaka, JP;
Shinji Nakaue, Osaka, JP;
Naoki Sogabe, Tokyo, JP;
Michio Imai, Tokyo, JP;
Toru Yamamoto, Tokyo, JP;
Shinichi Yamanobe, Tokyo, JP;
Kazumasa Okubo, Tokyo, JP;
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Abstract
An optical fiber-embedded PC steel strand includes a PC steel strand in which a plurality of PC steel wires are twisted together, and an optical fiber. The optical fiber is fixed with a resin in a twist groove that is a groove between two PC steel wires of the PC steel wires, the two PC steel wires being disposed at an outer surface of the PC steel strand and being next to each other. A coefficient of variation in distance between a common tangent of the two PC steel wires that form the twist groove and are next to each other, and a center of the optical fiber is 0.5 or less, as measured in 10 cross sections of the PC steel strand that are perpendicular to a longitudinal direction of the PC steel strand.