This inventor holds 1 USPTO granted patent. Top assignee: Teijin Limited. Active years: 2026.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Company Filing History:
Years Active: 2026
Title: Keisuke Yagi and Pitch-Based Ultrafine Carbon Fibers
Introduction
Keisuke Yagi is an inventor associated with Teijin Limited in Osaka, Japan. His patent work includes a technology for pitch-based ultrafine carbon fibers and their dispersion.
Latest Patents
Yagi is named on 1 patent, titled “Pitch-Based Ultrafine Carbon Fibers and Pitch-Based Ultrafine Carbon Fiber Dispersion.” The invention describes nitrogen-containing pitch-based ultrafine carbon fibers with an average diameter greater than 100 nanometers and no more than 900 nanometers. It specifies a nitrogen content of no more than 1.00 atomic percent, as measured by X-ray photoelectron spectroscopy, and a true density from 1.95 to 2.20 g/cm³.
Career Highlights
Yagi’s listed patent reflects work on the properties and dispersion of ultrafine carbon fibers, including their diameter, nitrogen content, and density. The available information identifies him as working at Teijin Limited.
Collaborations
Ryota Hirakawa is identified as Yagi’s coworker. The provided information does not specify their roles in the patent or the nature of their collaboration.
Conclusion
Keisuke Yagi’s patent focuses on defined material properties for nitrogen-containing pitch-based ultrafine carbon fibers, connecting his work at Teijin Limited with advanced carbon-fiber technology.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile