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For the Inventor, By the Inventor

Kofu, Japan

Toshihiko Koizumi

This inventor holds 4 USPTO granted patents. Top assignees: Ricoh Company, Ltd., Yamanashi Electronics Co., Ltd.. Active years: 2010-2013.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Toshihiko Koizumi. Retrieved from https://idiyas.com/inventor/toshihiko-koizumi

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

USPTO Granted Patents = 4

% Patents Active = 75.0

Average Co-Inventor Count = 6.5

ph-index = 1

Forward Citations = 3(Granted Patents)


Location History:

  • Kofu, JP (2010 - 2012)
  • Yamanashi, JP (2013)

Company Filing History:

goldMedal4 out of 28,951 
 
Ricoh Company, Ltd.
 patents
silverMedal2 out of 18 
 
Yamanashi Electronics Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 2010-2013

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4 patents (USPTO):Explore Patents
1. 8349529 - Electrophotographic photoconductor, and electrophotographic method, electrophotographic apparatus and process cartridge containing the electrophotographic photoconductor (2013-01-08),
2. 8263297 - Electrophotographic photoconductor and electrophotographic apparatus (2012-09-11),
3. 8257891 - Electrophotographic photoconductor, process cartridge and image forming apparatus (2012-09-04),
4. 7704655 - Electrophotographic photoreceptor and electrophotographic apparatus (2010-04-27),

Title: The Innovations of Toshihiko Koizumi

Introduction

Toshihiko Koizumi is a notable inventor based in Kofu, Japan. He has made significant contributions to the field of electrophotography, holding a total of four patents. His work has advanced the technology used in photocopiers and printers, making them more efficient and effective.

Latest Patents

Koizumi's latest patents include innovations in electrophotographic photoconductors and methods. One of his patents describes an electrophotographic photoconductor that features a conductive substrate and a photoconductive layer. This layer contains a charge generation agent and a charge transport agent represented by specific general formulas. Another patent focuses on an electrophotographic apparatus that includes a conductive support and a photosensitive layer, which also contains a charge generation agent, a charge transport agent, and a binder resin. These innovations highlight his expertise in enhancing the performance of electrophotographic devices.

Career Highlights

Throughout his career, Koizumi has worked with prominent companies such as Ricoh Company, Ltd. and Yamanashi Electronics Co., Ltd. His experience in these organizations has allowed him to develop and refine his inventions, contributing to advancements in the industry.

Collaborations

Koizumi has collaborated with notable coworkers, including Hajime Suzuki and Hideki Nakamura. Their combined efforts have led to significant developments in the field of electrophotography.

Conclusion

Toshihiko Koizumi's contributions to electrophotography through his patents and collaborations have made a lasting impact on the industry. His innovative work continues to influence the development of efficient printing technologies.

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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