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For the Inventor, By the Inventor

Tokyo, Japan

Pentel Kabushiki Kaisha

Calculating rank
USPTO Granted Patents = 264

% Expired Patents = 1.9


Trademarks = 14

Forward Citations = 4,588

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176 inventors (with patents filed for the assignee):

goldMedal Shigeo Oka (39 out of 41 patents)

silverMedal Kazuhisa Shimizu (36 out of 36 patents)

bronzeMedal Tomoaki Shibata (30 out of 36 patents)

4.  Hidekazu Nakazawa (22 out of 23 patents)

5.  Tomozo Sekiguchi (12 out of 12 patents)

6.  Kunio Itoh (10 out of 14 patents)

7.  Kiyomi Abe (8 out of 8 patents)

8.  Junichi Hashimoto (7 out of 176 patents)

9.  Masayuki Kawasaki (6 out of 10 patents)

10.  Yoshihiro Wada (6 out of 6 patents)

11.  Gouji Sakaoka (6 out of 9 patents)

12.  Kunio Ito (6 out of 6 patents)

13.  Masamitsu Nagahama (5 out of 17 patents)

14.  Kazunori Suzuki (5 out of 9 patents)

15.  Shigeki Maruyama (4 out of 9 patents)


Core Competencies:
Ballpoint Pen
Mechanical Pencil
Marking Pen
Ink Composition
Correction Tape
Grip Structure
Cap for Pen
Retractable Writing Material
Oily Ink
Lead Case
Electronic Pen
Writing Instrument

264 patents:

1. D1034808 - Ballpoint pen (2024-07-09),
2. D1034807 - Ballpoint pen (2024-07-09),
3. D1028088 - Marking pen (2024-05-21),
4. 11697743 - Ink composition, writing instrument and method for producing ink composition (2023-07-11),
5. 11613663 - Ink composition, writing tool and method for producing ink composition (2023-03-28),
6. D978244 - Ballpoint pen (2023-02-14),
7. D977571 - Mechanical pencil (2023-02-07),
8. D956870 - Ballpoint pen (2022-07-05),
9. D956869 - Ballpoint pen (2022-07-05),
10. D902312 - Cap for pen (2020-11-17),
11. D902311 - Ballpoint pen (2020-11-17),
12. D876541 - Mechanical pencil (2020-02-25),
13. D876540 - Marking pen (2020-02-25),
14. D865869 - Marking pen (2019-11-05),
15. D846640 - Mechanical pencil (2019-04-23),
Company Overview
Pentel Kabushiki Kaisha, headquartered in Tokyo, Japan, is a leading manufacturer specializing in writing instruments. The company is renowned for its innovative products, including ballpoint pens, mechanical pencils, marking pens, and correction tape. Pentel focuses on advanced ink compositions and ergonomic designs, enhancing user experience through features like grip structures and retractable mechanisms. With a commitment to quality and creativity, Pentel continues to influence the global market for writing tools and stationery solutions.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Nov 3 2026

Pentel Kabushiki Kaisha USPTO Patent Assignee Logo
264 Patents

#296 in Tokyo

#579 in Japan

#3,318 in the World

Tokyo, JP
Tokyo, Japan

Pentel Kabushiki Kaisha

Forward Citations = 4,588

176 inventors:

goldMedal Shigeo Oka (39 out of 41 patents)

silverMedal Kazuhisa Shimizu (36 out of 36 patents)

bronzeMedal Tomoaki Shibata (30 out of 36 patents)

4.  Hidekazu Nakazawa (22 out of 23 patents)

5.  Tomozo Sekiguchi (12 out of 12 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Pentel Kabushiki Kaisha. Retrieved from https://idiyas.com/company/pentel-kabushiki-kaisha

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]
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