This inventor holds 1 USPTO granted patent. Top assignee: Shin-Etsu Quartz Products Ltd.. 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: Yu Ishihara and Quartz Glass Crucible Evaluation
Introduction
Yu Ishihara is an inventor associated with Echizen, Japan, and Shin-Etsu Quartz Products Ltd. His patent work addresses the evaluation and manufacture of quartz glass crucibles, which are used in demanding industrial processes.
Latest Patents
Ishihara is named on 1 patent: “Method for Evaluating Quartz Glass Crucible, Method for Manufacturing the Same, and Quartz Glass Crucible.” The invention describes a nondestructive method for assessing oxygen-deficiency defects in a crucible with an opaque, bubble-containing outer layer and a transparent inner layer. The method irradiates the crucible with ultraviolet light and detects whether blue fluorescence is emitted. The presence or absence of that fluorescence is used to evaluate the defects. The patent also describes using hydrogen doping and water-vapor introduction to support this evaluation.
Career Highlights
Ishihara’s documented patent contribution focuses on practical assessment of quartz glass crucibles. The approach is designed to make defect evaluation easier without damaging the crucible.
Collaborations
Ishihara’s patent lists Yuji Baba as a coworker. The invention is associated with Shin-Etsu Quartz Products Ltd.
Conclusion
Yu Ishihara’s patent work contributes a fluorescence-based method for evaluating oxygen-deficiency defects in quartz glass crucibles, supporting nondestructive inspection and manufacturing.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile