Isao Koishi

This inventor holds 55 USPTO granted patents and 10 published patent applications and 10 EPO patents, primarily in Electrophotographic Imaging (CPC class G03G). Top assignee: Canon Kabushiki Kaisha. Active years: 2006-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Isao Koishi. Retrieved from https://idiyas.com/inventor/isao-koishi

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

USPTO Granted Patents = 55 (Patent Applications = 10)

% Patents Active = 90.9

EPO Patents = 10 (Patent Applications = 14)

Average Co-Inventor Count = 3.5

ph-index = 17

Forward Citations = 1,267(Granted Patents)

Forward Citations (Not Self Cited) = 846(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Shizuoka, JP (2006 - 2008)
Susono, JP (2006 - 2014)
Yokohama, JP (2015 - 2024)
Kanagawa, JP (2022 - 2024)
Kanagawa-ken, JP (2024)

Company Filing History:

55 out of 92,901

Canon Kabushiki Kaisha

patents

Years Active: 2006-2026

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Areas of Expertise:

Image Forming Apparatus

Electrophotographic

Cartridge

Toner Container

Photosensitive Drum

Process Cartridge

Packing Member

Display Unit

Movable Member

Assembling Method

55 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12602006 - Cartridge and image forming apparatus (2026-04-14),

2. 12271136 - Image forming apparatus including a display unit for displaying information about a procedure for replenishing developer (2025-04-08),

3. 12130579 - Cartridge and drum unit for electrophotographic image forming apparatus (2024-10-29),

4. 12066786 - Cartridge and drum unit for electrophotographic image forming apparatus (2024-08-20),

5. 12066769 - Toner container having a shutter and an engaging portion exposed from the shutter (2024-08-20),

6. 12045005 - Cartridge assembly (2024-07-23),

7. D1015421 - Process cartridge for image forming apparatus (2024-02-20),

8. 11829096 - Cartridge, attachment and mounting kit (2023-11-28),

9. 11796947 - Image forming apparatus including a display unit for displaying information about a procedure for replenishing developer (2023-10-24),

10. 11754946 - Image forming apparatus (2023-09-12),

11. 11669044 - Cartridge having a portion-to-be-positioned and a pressing portion configured in relation to a corresponding apparatus (2023-06-06),

12. 11619905 - Cartridge detachably mountable to main assembly of electrophotographic image forming apparatus, assembling method for drive transmitting device for photosensitive drum, and electrophotographic image forming apparatus (2023-04-04),

13. 11579561 - Cartridge and drum unit for electrophotographic image forming apparatus (2023-02-14),

14. 11474452 - Image forming apparatus including an attachment portion to which to attach a supply container for supplying a developer (2022-10-18),

15. 11454912 - Image forming apparatus including a display unit for displaying information about a procedure for replenishing developer (2022-09-27),

Title: Isao Koishi: Innovator in Electrophotographic Technology

Introduction

Isao Koishi is a notable inventor based in Yokohama, Japan, with an impressive portfolio of 53 patents. His innovative contributions primarily focus on advancements in electrophotographic image forming apparatuses, demonstrating his commitment to enhancing technology in imaging and printing.

Latest Patents

Among his latest patents is a sophisticated cartridge and drum unit designed for electrophotographic image forming apparatuses. This innovative cartridge includes a photosensitive drum and developing roller, both of which are supported by a unique casing that contains an open groove channel. This design allows for efficient operation by aligning the rotational axis of the photosensitive drum with the groove, ensuring optimal performance during the imaging process. Furthermore, the incorporation of a coupling member that interacts with the photosensitive drum represents a significant enhancement in operational efficiency, allowing it to receive a rotational force to facilitate smoother functioning.

Career Highlights

Isao Koishi has made substantial contributions to the field of imaging technology while being associated with Canon Kabushiki Kaisha, a leading organization in the imaging and printing sector. His innovative spirit and technical expertise have led to numerous breakthroughs that have significantly advanced the efficiency and effectiveness of electrophotographic systems.

Collaborations

Throughout his career, Koishi has worked alongside esteemed colleagues such as Shigemi Kamoshida and Takeshi Arimitsu. Their collaborative efforts have fostered a rich environment of shared knowledge and innovation, allowing for the development of cutting-edge solutions in the imaging industry.

Conclusion

Isao Koishi stands as a prominent figure in the world of innovation, particularly in electrophotographic technology. His extensive list of patents and collaborations reflects his dedication to improving imaging systems and his significant impact on the industry. As technology continues to evolve, Koishi's contributions will undoubtedly play a crucial role in shaping the future of imaging and printing technologies.

Profile summary based on public USPTO records.