logo

For the Inventor, By the Inventor

Nagoya, Japan

Keiji Yoshida

This inventor holds 9 USPTO granted patents. Top assignee: Mitsubishi Rayon Company, Limited. Active years: 1990-1997.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiji Yoshida. Retrieved from https://idiyas.com/inventor/keiji-yoshida-pthk90jk

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Calculating rank
USPTO Granted Patents = 9

% Patents Active = 100.0

Average Co-Inventor Count = 4.7

ph-index = 4

Forward Citations = 45(Granted Patents)


Company Filing History:

goldMedal9 out of 1,357 
 
Mitsubishi Rayon Company, Limited
 patents

Years Active: 1990-1997

Loading Chart...
9 patents (USPTO):Explore Patents
1. 5674962 - Toner resin (1997-10-07),
2. 5409989 - Resin composition for toners (1995-04-25),
3. 5342722 - Toner resin composition and process for preparing same (1994-08-30),
4. 5227273 - Binder for toner and process for producing the same (1993-07-13),
5. 5204413 - Process fro producing resin for a toner (1993-04-20),
6. 5071918 - Process for producing resin for a toner (1991-12-10),
7. 5024914 - Resin for toner particle (1991-06-18),
8. 5009978 - Preparation process for toner polymer (1991-04-23),
9. 4971879 - Polymer for toner, process for preparation thereof and toner composition (1990-11-20),

Title: Keiji Yoshida: Innovator in Toner Resin Technology

Introduction

Keiji Yoshida is a prominent inventor based in Nagoya, Japan. He has made significant contributions to the field of toner resin technology, holding a total of 9 patents. His work has been instrumental in developing materials that enhance the performance of copying machines.

Latest Patents

Yoshida's latest patents include innovative formulations for toner resins. One notable patent describes a toner resin that comprises a styrene component, an acrylic acid ester component, and a divinyl monomer component. This resin exhibits a glass transition temperature ranging from 50 to 68 degrees Celsius, a tan delta value of 0.3 to 0.7 at 200 degrees Celsius, and a gel fraction of 55 to 83%. The softening point of this resin, where it has a melting viscosity of 100,000 poises, is between 200 to 410 degrees Celsius. This toner is designed to provide excellent fixing properties, non-offsetting characteristics, and blocking resistance, making it suitable for high-temperature, high-speed copying machines. Another patent focuses on a resin composition for toners, which includes a suspension polymerizate of a polyester and vinyl monomers, ensuring optimal performance in various applications.

Career Highlights

Keiji Yoshida is currently employed at Mitsubishi Rayon Company, Limited, where he continues to innovate in the field of polymer chemistry. His expertise in developing advanced toner resins has positioned him as a key figure in the industry.

Collaborations

Yoshida has collaborated with notable colleagues such as Syuji Takahiro and Motoshi Inagaki. Their combined efforts have led to advancements in toner technology and improved product offerings in the market.

Conclusion

Keiji Yoshida's contributions to toner resin technology have significantly impacted the industry. His innovative patents and collaborations reflect his dedication to advancing material science.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
Loading…