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For the Inventor, By the Inventor

Kunitachi, Japan

Mikio Koyama

This inventor holds 51 USPTO granted patents, primarily in Electrophotographic Toner (CPC class 422 ). Top assignees: Konishiroku Photo Industry Co., Ltd., Konica Minolta Business Technologies, Inc., Kabushiki Kaisha Toshiba. Active years: 1979-2012.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Mikio Koyama. Retrieved from https://idiyas.com/inventor/mikio-koyama

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

USPTO Granted Patents = 51

% Patents Active = 82.4

Average Co-Inventor Count = 2.7

ph-index = 15

Forward Citations = 610(Granted Patents)

Forward Citations (Not Self Cited) = 600(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokorozawa, JP (1979)
  • Tokorosawa, JP (1980 - 1990)
  • Yokohama, JP (1986 - 1992)
  • Kawasaki, JP (1993 - 1997)
  • Hino, JP (1980 - 2002)
  • Kunitachi, JP (2008 - 2011)
  • Tokyo, JP (1992 - 2012)

Company Filing History:

goldMedal18 out of 1,252 
 
Konishiroku Photo Industry Co., Ltd.
 patents
silverMedal11 out of 2,526 
 
Konica Minolta Business Technologies, Inc.
 patents
bronzeMedal9 out of 53,250 
 
Kabushiki Kaisha Toshiba
 patents
4. 8 out of 3,106 
 
Konica Corporation
 patents
5. 2 out of 985 
 
Chugai Seiyaku Kabushiki Kaisha
 patents
6. 2 out of 9,364 
 
Lucent Technologies Inc.
 patents
7. 1 out of 3 
 
Konica Minolta Business Machines Technologies, Inc.
 patents
8. 1 out of 16 
 
Konishiroku Photo Ind. Co., Ltd.
 patents
9. 1 out of 2,916 
 
Tokyo Shibaura Denki Kabushiki Kaisha
 patents
where one patent can have more than one assignee

Years Active: 1979-2012

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Areas of Expertise:
Electrophotographic Toner
Toner Manufacturing
Image Forming Method
Electrostatic Image Development
Toner Particle Production
Non-Spherical Particles
Polymer Particles
Immunological Assay
Analytical Element
Differential Amplifier
Integration Circuit
Band-Pass Filter
51 patents (USPTO):Explore Patents
1. 8206882 - Toner (2012-06-26),
2. 7932011 - Electrophotographic toner and manufacturing method thereof (2011-04-26),
3. 7807327 - Method for producing electrophotographic toner (2010-10-05),
4. 7682769 - Method of manufacturing toner, toner, and image forming method (2010-03-23),
5. 7682767 - Method of manufacturing toner, toner, and image forming method (2010-03-23),
6. 7642030 - Toner, manufacturing method thereof and image forming method (2010-01-05),
7. 7563554 - Electrophotographic toner (2009-07-21),
8. 7541129 - Electrostatic image developing toner (2009-06-02),
9. 7524601 - Toner and method of manufacturing the toner (2009-04-28),
10. 7491481 - Method of manufacturing toner, toner, and image forming method (2009-02-17),
11. 7470496 - Electrostatic image developing toner (2008-12-30),
12. 7445878 - Electrostatic charge image developing toner (2008-11-04),
13. 6395442 - Toner and production method of the same (2002-05-28),
14. 5863696 - Toner particle for electrophotography and production method thereof (1999-01-26),
15. 5851713 - Toner for developing an electrostatic latent image (1998-12-22),

Title: **Mikio Koyama: Innovator in Toner Technology**

Introduction

Mikio Koyama, a prolific inventor based in Kunitachi, Japan, is renowned for his contributions to the field of electrophotographic toner technology. With an impressive portfolio of 51 patents, Koyama has significantly advanced the reproducibility and stability of color toners in printing applications.

Latest Patents

Among his latest innovations, Koyama has developed a toner designed to improve color reproducibility and density stability. This specific toner includes a resin and a colorant, featuring compounds represented by general formula (1) and (2). Each compound has its unique composition, wherein general formula (1) highlights various potential substituents such as hydrogen atoms, halogen atoms, and alkyl groups, emphasizing the presence of chlorine atoms. Meanwhile, general formula (2) details a range of hydrogen and alkyl group configurations as well. Furthermore, Koyama's innovation extends to the manufacturing method of electrophotographic toners, which provides a systematic approach to produce high-quality toner products.

Career Highlights

Throughout his career, Koyama has been associated with notable companies in the imaging and printing industry, including Konishiroku Photo Industry Co., Ltd. and Konica Minolta Business Technologies, Inc. His tenure at these organizations has allowed him to make significant strides in imaging technology and toner development.

Collaborations

Koyama has worked alongside distinguished colleagues such as Kenji Hayashi and Kenichiro Okaniwa. Their collaborations have fostered innovation and have enabled the development of cutting-edge technologies that enhance the efficiency and quality of printing solutions.

Conclusion

Mikio Koyama’s contributions to toner technology have played a crucial role in advancing the capabilities of printing systems. His extensive patent portfolio reflects his commitment to innovation and excellence, ensuring that the field of electrophotographic toners continues to evolve and meet the demands of modern printing technology.

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]
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