This inventor holds 4 USPTO granted patents. Top assignee: Konica Corporation. Active years: 1994-2000.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Company Filing History:
Years Active: 1994-2000
Title: Tomoyasu Umeno and His Patents in Electrostatic Image Development.
Introduction
Tomoyasu Umeno is an inventor associated with Hachioji, Japan, and Konica Corporation. His patent work includes technologies for carriers and developers used in electrostatic image development. The provided information lists 4 patents.
Latest Patents
Two of Umeno’s listed patents concern carriers for developing electrostatic images. One describes a carrier with a magnetite core and resin coating. The core contains FeO and Fe₂O₃ at a specified mole ratio, while magnesium-containing material at the carrier surface is controlled within a stated range. The patent also describes a developer and a developing method using the carrier.
Another patent describes a developer carrier with a specified magnesium content in its surface portion. The invention aims to support consistent charge-rising performance over extended use while reducing toner scattering and background deposits on images.
Career Highlights
Umeno’s listed inventions focus on materials and surface properties that affect the performance of electrostatic image development. His work connects carrier composition with charging behavior and image quality.
Collaborations
The provided information names Meizo Shirose and Ryuji Kitani as Umeno’s coworkers. It does not specify their roles in the listed patents.
Conclusion
Tomoyasu Umeno’s listed patent work at Konica Corporation addresses carrier and developer technologies designed to support stable charging and cleaner electrostatic images.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile