Keitaro Tsuboki

This inventor holds 10 USPTO granted patents. Top assignees: Sony Corporation, Pentel Kabushiki Kaisha. Active years: 1999-2005.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keitaro Tsuboki. Retrieved from https://idiyas.com/inventor/keitaro-tsuboki

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

USPTO Granted Patents = 10

% Patents Active = 100.0

Average Co-Inventor Count = 2.1

ph-index = 7

Forward Citations = 328(Granted Patents)

Company Filing History:

Pentel Kabushiki Kaisha

patents

Years Active: 1999-2005

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10 patents (USPTO):Sort by Forward CitationsExplore Patents

1. D507811 - Ball point pen (2005-07-26),

2. D504465 - Cap for a writing instrument (2005-04-26),

3. D459378 - Electronic still camera (2002-06-26),

4. D457515 - Earphone (2002-05-22),

5. D450713 - Audio player (2001-11-21),

6. D445103 - Tape player (2001-07-18),

7. D438527 - Tape player (2001-03-07),

8. D436103 - Front portion of tape player (2001-01-10),

9. D413593 - Selecting device (1999-09-07),

10. D410925 - Audio disc player combined with radio receiver and tape recorder (1999-06-15),

Title: The Innovative Journey of Keitaro Tsuboki

Introduction

Keitaro Tsuboki is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of writing instruments, holding a total of 10 patents. His work has influenced the design and functionality of everyday writing tools.

Latest Patents

Among his latest patents are innovative designs for a ballpoint pen and a cap for a writing instrument. These inventions showcase his commitment to enhancing user experience and functionality in writing products.

Career Highlights

Throughout his career, Tsuboki has worked with renowned companies such as Sony Corporation and Pentel Kabushiki Kaisha. His experience in these organizations has allowed him to refine his skills and contribute to various innovative projects.

Collaborations

Tsuboki has collaborated with notable individuals in the industry, including Satoshi Masamitsu and Yoshinori Yamada. These partnerships have further enriched his inventive journey and expanded his creative horizons.

Conclusion

Keitaro Tsuboki's contributions to the world of writing instruments reflect his innovative spirit and dedication to improving everyday tools. His patents and collaborations highlight his significant impact on the industry.

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]