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For the Inventor, By the Inventor

Ibaraki, Japan

Ryuuichi Shimizu

This inventor holds 13 USPTO granted patents. Top assignees: Hitachi Koki Co., Ltd., Hitachi, Ltd., Ricoh Printing Systems, Ltd.. Active years: 1994-2008.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Ryuuichi Shimizu. Retrieved from https://idiyas.com/inventor/ryuuichi-shimizu

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

USPTO Granted Patents = 13

% Patents Active = 61.5

Average Co-Inventor Count = 4.8

ph-index = 6

Forward Citations = 98(Granted Patents)


Location History:

  • Hitachiota, JP (1994 - 1997)
  • Hitachioota, JP (2000)
  • Ibaraki, JP (2000 - 2008)

Company Filing History:

goldMedal6 out of 1,267 
 
Hitachi Koki Co., Ltd.
 patents
silverMedal6 out of 42,726 
 
Hitachi, Ltd.
 patents
bronzeMedal4 out of 129 
 
Ricoh Printing Systems, Ltd.
 patents
4. 2 out of 47 
 
Hitachi Printing Solutions, Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1994-2008

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13 patents (USPTO):Explore Patents
1. 7459252 - Electrophotographic toner (2008-12-02),
2. 7327974 - Electrophotographic toner and image-forming system (2008-02-05),
3. 7144667 - Electrostatic charge image developing toner, and developer, image forming apparatus and image forming method using the same toner (2006-12-05),
4. 7022448 - Electrophotographic toner and image-forming system (2006-04-04),
5. 6783909 - Electrostatic image developing toner and image forming method (2004-08-31),
6. 6696210 - Electrostatic charge developing toner and image forming method using the same (2004-02-24),
7. 6131000 - Electrophotographic printing apparatus using electric potential dividing (2000-10-10),
8. 6094558 - Transfer belt and electrophotographic apparatus (2000-07-25),
9. 5649273 - Belt-type fixing device having an irregular surface contour (1997-07-15),
10. 5519479 - Fixing device for electrophotography and electrophotographic apparatus (1996-05-21),
11. 5508138 - Fixing device for electrophotography and electrophotographic apparatus (1996-04-16),
12. 5363180 - Fixing device for electrophotography and electrophotographic apparatus (1994-11-08),
13. 5345301 - Image fixing device and electrophotographic apparatus incorporated with (1994-09-06),

Title: Ryuuichi Shimizu: Innovator in Electrophotographic Toner Technology

Introduction

Ryuuichi Shimizu is a prominent inventor based in Ibaraki, Japan. He has made significant contributions to the field of electrophotographic toner technology, holding a total of 13 patents. His work emphasizes environmental safety and innovation in imaging processes.

Latest Patents

Shimizu's latest patents focus on the development of electrophotographic toners designed for visualizing electrostatic latent images. These toners are produced with a strong consideration for environmental impact and safety. One of his notable inventions is a black toner that utilizes a titanium compound, which contains no carbon black as the colorant. Additionally, he has developed a two-component black toner that employs magnetic iron oxide, also free from carbon black.

Career Highlights

Throughout his career, Ryuuichi Shimizu has worked with reputable companies such as Hitachi Koki Co., Ltd. and Hitachi, Ltd. His experience in these organizations has allowed him to refine his expertise in toner technology and contribute to advancements in the field.

Collaborations

Shimizu has collaborated with notable colleagues, including Tsuneaki Kawanishi and Shigenori Yaguchi. These partnerships have fostered innovation and development in his projects.

Conclusion

Ryuuichi Shimizu's work in electrophotographic toner technology showcases his commitment to innovation and environmental safety. His contributions have significantly impacted the imaging industry, making him a noteworthy inventor in this field.

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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