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For the Inventor, By the Inventor

Kawasaki, Japan

Sotohiro Tsujihara

This inventor holds 6 USPTO granted patents. Top assignee: Ricoh Company, Ltd.. Active years: 1987-2009.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Sotohiro Tsujihara. Retrieved from https://idiyas.com/inventor/sotohiro-tsujihara

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

Calculating rank
USPTO Granted Patents = 6

% Patents Active = 83.3

Average Co-Inventor Count = 1.6

ph-index = 4

Forward Citations = 56(Granted Patents)


Location History:

  • Tokyo, JP (1987)
  • Kanagawa, JP (1999)
  • Kawasaki, JP (1999 - 2009)

Company Filing History:

goldMedal6 out of 28,957 
 
Ricoh Company, Ltd.
 patents

Years Active: 1987-2009

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6 patents (USPTO):Explore Patents
1. 7603055 - Cover for image forming apparatus to facilitate parts recycling (2009-10-13),
2. 6393246 - Fixing device and method having a shield member for cutting off air flowing through gap and image forming apparatus using the same fixing device (2002-05-21),
3. 6080255 - Method of and an apparatus for removing image forming substance from an (2000-06-27),
4. 5968301 - Method of recycling image supporting material and apparatus thereof (1999-10-19),
5. 5897726 - Method of and an apparatus for removing image forming substance from an (1999-04-27),
6. 4692020 - Sheet reversing in copying machine and other sheet-handling machines (1987-09-08),

Title: Sotohiro Tsujihara: Inventor in Image-Forming Technology

Introduction

Sotohiro Tsujihara is an inventor based in Kawasaki, Japan, associated with Ricoh Company, Ltd. His work includes inventions for image-forming apparatuses and their components. He is credited with 6 patents.

Latest Patents

- **Cover for image forming apparatus to facilitate parts recycling.** This invention describes an apparatus cover with a plate and ribs on its inner surface that form compartments. The compartments are designed to hold corresponding parts removed from the apparatus, supporting parts organization during recycling.

- **Fixing device and method having a shield member for cutting off air flowing through gap, and image forming apparatus using the same fixing device.** This invention concerns a device that fixes a toner image onto a sheet. It includes fusing and pressure rollers, a separating member, and a sheet guide. A shield member blocks airflow through the gap between the frame and the sheet guide where the guide is supported.

Career Highlights

Tsujihara’s listed patents address practical aspects of image-forming equipment, including component recycling and airflow management in a fixing device. These inventions reflect work on both the maintenance and operation of printing apparatuses.

Collaborations

His listed coworkers include fellow inventors Tarou Terashi and Tomoaki Sugawara. His work is associated with Ricoh Company, Ltd.

Conclusion

Sotohiro Tsujihara’s patent portfolio includes inventions focused on improving the handling, recycling, and operation of image-forming apparatus components.

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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