Tomofumi Yoshida

USPTO Granted Patents = 50 (Patent Applications = 1)

EPO Patents = 3 (Patent Applications = 2)

Average Co-Inventor Count = 5.2

ph-index = 10

Forward Citations = 268(Granted Patents)

Forward Citations (Not Self Cited) = 238(Oct 12, 2025)

Inventors with similar research interests:

Location History:

Hitachi, JP (2003)
Oosaka, JP (2008 - 2009)
Tokyo, JP (2008 - 2012)
Ibaraki, JP (2007 - 2013)
Ikeda, JP (2016)
Kanagawa, JP (2021)
Osaka, JP (2010 - 2022)

Company Filing History:

Ricoh Printing Systems, Ltd.

patents

1 out of 90,594

Canon Kabushiki Kaisha

Years Active: 2003-2022

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50 patents (USPTO):Sort by Forward Citations

Abstract keywords

1. 11231664 - Toner container having a shutter, a lever disposed on one side, and a pivoting portion on the other side which rotate together with a common shaft (2022-01-25),

2. 10915063 - Removable unit and image forming apparatus incorporating same (2021-02-09),

3. 10915040 - Toner container with an operating structure disposed on a first side, a shutter disposed on a second side, and a lock (2021-02-09),

4. 10564572 - Toner container with an operating structure disposed on a first side, and a shutter disposed on a second side (2020-02-18),

5. 10365584 - Toner container, developing device, process cartridge, and image forming apparatus that include a toner container contacting surface to contact with a developing device engagement releasing structure (2019-07-30),

6. 10025227 - Toner container, developing device, process cartridge, and image forming apparatus that include a toner container contacting surface to contact with a developing device engagement releasing structure (2018-07-17),

7. 9690231 - Toner container, developing device, process cartridge, and image forming apparatus that include an operating member to move a shutter for a toner outlet via a linking member (2017-06-27),

8. 9500992 - Developing device having a powder conveyor, process cartridge, and image forming apparatus including the same (2016-11-22),

9. 9229372 - Developing device, process cartridge, and image forming apparatus (2016-01-05),

10. 9201393 - Toner container, process cartridge, and image forming apparatus (2015-12-01),

11. 9042745 - Developer amount detector, image forming apparatus incorporating same, and positioning structure for positioning unit within image forming apparatus (2015-05-26),

12. 8913926 - Developer container, developing device, process cartridge, image forming device, and developer refilling method (2014-12-16),

13. 8861991 - Developer amount detector, and developer container, development device, and image forming apparatus incorporating same (2014-10-14),

14. 8843005 - Developing device, process unit, and image forming apparatus (2014-09-23),

15. 8768203 - Image forming apparatus capable of effectively utilizing interior space (2014-07-01),

Title: **Tomofumi Yoshida: Innovator in Toner Container Technology**

Introduction

Tomofumi Yoshida, based in Osaka, Japan, is a prolific inventor known for his advancements in toner container technology. With an impressive portfolio of 50 patents, Yoshida has significantly contributed to improving the efficiency and functionality of developing devices used in printing applications.

Latest Patents

Among his recent innovations are two notable patents related to toner containers. The first patent details a toner container that features a shutter, a lever, and a pivoting portion rotating together with a common shaft. This design allows the container to be detachably attached to a developing device while integrating an outlet for discharging toner, an agitating member to stir the toner, and a coupling for transmitting driving forces.

The second patent presents another innovative toner container characterized by an operating structure on one side and a shutter on the opposite side. This design focuses on an advanced inlet mechanism that includes a biasing mechanism and engaging structures to maintain an efficient operation in relation to the container's inlet shutter.

Career Highlights

Yoshida's career includes significant roles in leading companies such as Ricoh Company, Ltd. and Ricoh Printing Systems, Ltd. His work has consistently been aligned with enhancing printing technologies, particularly through his innovative designs for toner containers.

Collaborations

Throughout his career, Tomofumi Yoshida has collaborated with esteemed colleagues, including Hirobumi Ooyoshi and Yoshiyuki Shimizu. Their joint efforts have fostered a creative environment that provides a foundation for their groundbreaking inventions.

Conclusion

In summary, Tomofumi Yoshida stands out as a key figure in the field of toner container technology. His 50 patents and collaborative spirit reflect his commitment to innovation and excellence in the printing industry. Through his work, he continues to pave the way for advancements that improve user experience and operational efficiency in developing devices.

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1 patent pending:

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3 patents (EPO):

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2 patents pending (EPO):

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