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For the Inventor, By the Inventor

Osaka, Japan

Kenzo Tatsumi

This inventor holds 51 USPTO granted patents, plus 1 CIPO patent and 4 EPO patents, primarily in Image Forming Apparatus (CPC class 399 ). Top assignee: Ricoh Company, Ltd.. Active years: 1996-2013.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kenzo Tatsumi. Retrieved from https://idiyas.com/inventor/kenzo-tatsumi

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 = 74.5



Average Co-Inventor Count = 4.5

ph-index = 18

Forward Citations = 916(Granted Patents)

Forward Citations (Not Self Cited) = 795(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Kanagawa-ken, JP (1998 - 2004)
  • Yokohama, JP (1996 - 2005)
  • Kanagawa, JP (1999 - 2007)
  • Toyonaka, JP (2007 - 2009)
  • Ohsaka, JP (2008 - 2009)
  • Oosaka, JP (2008 - 2009)
  • Tokyo, JP (2011)
  • Osaka, JP (2009 - 2013)

Company Filing History:

goldMedal51 out of 28,934 
 
Ricoh Company, Ltd.
 patents

Years Active: 1996-2013

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Areas of Expertise:
Image Forming Apparatus
Toner Cartridge
Developing Device
Process Cartridge
Toner Conveyance
Powder Transport
Waste-Toner Collection
Toner Recovery
Electrophotography
Toner Agitation
Cleaning Device
Charging-Roller Bearing
51 patents (USPTO):Explore Patents
1. 8442414 - Seal member, developing device, process cartridge, and image forming apparatus (2013-05-14),
2. 8275285 - Process cartridge and image forming apparatus (2012-09-25),
3. 8260186 - Toner cartridge with refillable fresh and residual toner chambers, process cartridge, and method of making toner cartridge reusable (2012-09-04),
4. 8208832 - Toner-collecting device and image forming apparatus (2012-06-26),
5. 8160476 - Latent image carrier having pairs of first and second positioning protrusions and image forming apparatus (2012-04-17),
6. 8135329 - Toner conveyer device, process cartridge, and image forming apparatus (2012-03-13),
7. 8135313 - Powder transport screw, and development device, process unit and image-forming apparatus comprising this powder transport screw (2012-03-13),
8. 8103195 - Toner agitating unit, toner hopper, process cartridge, and image forming apparatus (2012-01-24),
9. 8095035 - Developing device, process unit, and image forming apparatus, with supporting members, grooves, and supported developing roller (2012-01-10),
10. 8081897 - Seal member, developing device, process cartridge, and image forming apparatus (2011-12-20),
11. 8068770 - Toner cartridge, image forming apparatus, method of recycling toner cartridge (2011-11-29),
12. 8019254 - Toner conveying device, process cartridge, and image forming apparatus (2011-09-13),
13. 7979013 - Developing device of image forming apparatus (2011-07-12),
14. 7965958 - Developing device, process cartridge and image forming apparatus (2011-06-21),
15. 7965957 - Developing device and image forming apparatus that uses this developing device (2011-06-21),

Title: Kenzo Tatsumi: Innovating the Document Imaging Industry

Introduction: Kenzo Tatsumi, a prolific inventor based in Osaka, Japan, has made significant contributions to the field of document imaging with an impressive portfolio of 51 patents. His innovative spirit and attention to detail have propelled him to the forefront of technological advancements in the industry.

Latest Patents: Among Kenzo Tatsumi's recent patents is a revolutionary seal member designed to cover the space between a developing roller and the casing of a developing device. This seal member, crafted with a flexible sheet and a unique reinforcing member, enhances the efficiency and durability of the device. Additionally, his process cartridge and image forming apparatus showcase his expertise in optimizing the functionality of critical components within document imaging systems.

Career Highlights: Kenzo Tatsumi is a valued member of the renowned Ricoh Company, Ltd., a leading global provider of document management solutions. Through his inventive prowess, he has played a key role in shaping the direction of the company's product development strategies and maintaining its competitive edge in the market.

Collaborations: In his collaborative efforts, Kenzo Tatsumi has worked closely with esteemed colleagues such as Yoshiyuki Shimizu and Hirobumi Ooyoshi. Together, they have synergized their talents to drive innovation and bring cutting-edge solutions to the document imaging landscape.

Conclusion: Kenzo Tatsumi's unwavering dedication to innovation and his remarkable ability to transform ideas into tangible assets have established him as a trailblazer in the document imaging domain. His inventive spirit continues to inspire the next generation of inventors and solidify his legacy as a driving force behind technological progress.

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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