This inventor holds 1 USPTO granted patent and 1 published patent application and 1 EPO patent. Top assignee: Fujifilm Corporation. 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: Yasushi Toyoshima: Piezoelectric Element Innovation.
Introduction
Yasushi Toyoshima is an inventor associated with Fujifilm Corporation in Kanagawa, Japan. His patent work includes an invention concerning the structure and manufacture of piezoelectric elements.
Latest Patents
Toyoshima is credited with 1 patent: “Piezoelectric Element and Manufacturing Method for Piezoelectric Element.” The invention describes a piezoelectric element built on a substrate with a lower electrode layer, a piezoelectric film, and an upper electrode layer. The upper electrode includes an oxide conductive layer and an amorphous interface layer containing a constituent element of that oxide layer and an OH group. The interface layer is specified as 1 to 5 nanometers thick, with an OH-related oxygen peak intensity ratio of at least 0.35 relative to the peak intensity for oxygen bonded to a metal.
Career Highlights
The patent reflects Toyoshima’s work on piezoelectric device materials and manufacturing methods. Its detailed interface-layer specifications define a particular structure for the boundary between the piezoelectric film and the oxide conductive layer.
Collaborations
Toyoshima’s listed coworkers include Seigo Nakamura and Hiroyuki Kobayashi. The available information identifies these professional associations but does not specify their roles in the patent.
Conclusion
Yasushi Toyoshima’s patent documents a specific approach to piezoelectric element design, focusing on the composition, thickness, and structure of an interface layer.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile