% Expired Patents = 11.1

Forward Citations = 131

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8 inventors (with patents filed for the assignee):

Koji Seki (6 out of 8 patents)

Yoshimi Kano (3 out of 5 patents)

Masamichi Yoshida (2 out of 2 patents)

4. Yosimi Kano (2 out of 2 patents)

5. Jung Han Sin (1 out of 1 patent)

6. Atsushi Kaneko (1 out of 1 patent)

7. Ryoichi Seki (1 out of 1 patent)

8. Jiro Usui (1 out of 1 patent)

9 patents: Sort by Forward Citations

1. 7547355 - Solid drawing material (2009-06-16),

2. 6602332 - Solid glitter marker (2003-08-05),

3. 6042940 - Solid adhesive (2000-03-28),

4. 5725642 - Solid painting material (1998-03-10),

5. 5236494 - Solid painting material (1993-08-17),

6. D316730 - Puzzle crayon (1991-05-07),

7. 4936699 - Toy accessories (1990-06-26),

8. 4918130 - Eraser (1990-04-17),

9. 4768987 - Toy automobile having a body formed by a composition for writing (1988-09-06),

Company Overview

Buncho Corporation is a leading technology company specializing in software development and IT solutions. With a focus on innovation and customer satisfaction, Buncho Corp offers a wide range of services including web development, mobile app development, and digital marketing. Our team of skilled professionals is dedicated to delivering high-quality solutions tailored to meet the needs of our clients.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

9 Patents

#2,019 in Tokyo

#4,696 in Japan

Tokyo, Japan

Buncho Corporation

Forward Citations = 131

8 inventors:

Koji Seki (6 out of 8 patents)

Yoshimi Kano (3 out of 5 patents)

Masamichi Yoshida (2 out of 2 patents)

4. Yosimi Kano (2 out of 2 patents)

5. Jung Han Sin (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Buncho Corporation. Retrieved from https://idiyas.com/company/buncho

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

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]