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For the Inventor, By the Inventor

Ibaraki, Japan

Tsuneaki Kawanishi

This inventor holds 24 USPTO granted patents, primarily in Electrophotographic Technology. Top assignees: Hitachi, Ltd., Hitachi Koki Co., Ltd., Hitachi Printing Solutions, Ltd.. Active years: 1981-2009.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tsuneaki Kawanishi. Retrieved from https://idiyas.com/inventor/tsuneaki-kawanishi

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

USPTO Granted Patents = 24

% Patents Active = 75.0

Average Co-Inventor Count = 5.1

ph-index = 8

Forward Citations = 219(Granted Patents)


Location History:

  • Hitachi, JP (1981 - 1990)
  • Tokai, JP (1993)
  • Naka, JP (1994)
  • Ibaraki-ken, JP (1997)
  • Toukai-mura, JP (1997 - 1999)
  • Ibaraki, JP (1991 - 2009)

Company Filing History:

goldMedal10 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal8 out of 1,267 
 
Hitachi Koki Co., Ltd.
 patents
bronzeMedal4 out of 47 
 
Hitachi Printing Solutions, Ltd.
 patents
4. 3 out of 129 
 
Ricoh Printing Systems, Ltd.
 patents
5. 2 out of 2,333 
 
Hitachi Metals, Ltd.
 patents
6. 1 out of 265 
 
Dainichiseika Color & Chemicals Mfg. Co., Ltd.
 patents
7. 1 out of 1,641 
 
Hitachi Chemical Company, Ltd.
 patents
8. 1 out of 1 
 
Hitachi Metals Co., Ltd.
 patent
9. 1 out of 28,951 
 
Ricoh Company, Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1981-2009

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Areas of Expertise:
Electrophotographic Apparatus
Image Forming Method
Electrostatic Toner
Developing Unit
Fixing Device
Photosensitive Element
Magnetic Toner
White Ink Composition
Transfer Bias
Electrophotographic Process
Image Fixing Device
Electrostatic Recording
24 patents (USPTO):Explore Patents
1. 7574164 - Developing device and electrophotographic apparatus using the same (2009-08-11),
2. 7144667 - Electrostatic charge image developing toner, and developer, image forming apparatus and image forming method using the same toner (2006-12-05),
3. 7090956 - Image forming method and image forming apparatus (2006-08-15),
4. 7022448 - Electrophotographic toner and image-forming system (2006-04-04),
5. 6829449 - Image forming apparatus with transfer bias inverting function (2004-12-07),
6. 6813462 - Electro-photographic developing unit (2004-11-02),
7. 6783909 - Electrostatic image developing toner and image forming method (2004-08-31),
8. 6696210 - Electrostatic charge developing toner and image forming method using the same (2004-02-24),
9. 6157798 - Electrostatic recording apparatus (2000-12-05),
10. 5923933 - Electrophotographic apparatus (1999-07-13),
11. 5832347 - Toner for recording electrostatic image and electrostatic recording (1998-11-03),
12. 5701560 - Image forming apparatus having a photosensitive body formed of a base (1997-12-23),
13. 5649273 - Belt-type fixing device having an irregular surface contour (1997-07-15),
14. 5519479 - Fixing device for electrophotography and electrophotographic apparatus (1996-05-21),
15. 5508138 - Fixing device for electrophotography and electrophotographic apparatus (1996-04-16),

Title: Tsuneaki Kawanishi: Innovator in Electrophotographic Technology

Introduction

Tsuneaki Kawanishi, a prominent inventor based in Ibaraki, Japan, has made significant contributions to the field of electrophotographic technology. With a remarkable portfolio of 24 patents, his work has advanced the way imaging and printing technologies are developed and utilized in various applications.

Latest Patents

Among his latest patents, Kawanishi has developed a device and an electrophotographic apparatus that optimizes the process of toner image formation. This apparatus includes a photoconductor and two developing rollers that feed a specialized developer, consisting of a carrier with specific properties. Notably, the developer features a volume-average particle size smaller than 70 µm and a volume resistivity of at least 10Ω·cm. A crucial aspect of this invention is the defined volume ratio of the carrier within the developing rollers, which ranges from 30% to 46%. Additionally, he has created an electrostatic charge image developing toner that integrates a fixing resin and wax, characterized by distinct thermal properties measured by a differential scanning calorimeter.

Career Highlights

Kawanishi has had a successful career with notable associations at industry leaders such as Hitachi, Ltd. and Hitachi Koki Co., Ltd. His roles in these companies have allowed him to focus on advancing technology and securing numerous patents that enhance printing efficiency and image quality.

Collaborations

Throughout his career, Kawanishi has collaborated with esteemed colleagues, including Ryuuichi Shimizu and Teruaki Mitsuya. Together, they have worked on groundbreaking projects that address the evolving needs of the imaging technology sector, fostering innovation and excellence in their respective fields.

Conclusion

With his extensive experience and a solid foundation in developing advanced electrophotographic technologies, Tsuneaki Kawanishi stands as a key figure in innovation. His contributions continue to influence the industry, paving the way for new advancements that improve imaging processes and technologies in the modern world.

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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