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For the Inventor, By the Inventor

Saitama, Japan

Kotobuki Co., Ltd.

Calculating rank
USPTO Granted Patents = 294

% Expired Patents = 14.3


Trademarks = 6

Forward Citations = 3,700

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62 inventors (with patents filed for the assignee):

goldMedal Hidehei Kageyama (95 out of 105 patents)

silverMedal Hiromichi Izushima (53 out of 53 patents)

bronzeMedal Yoshihide Mitsuya (52 out of 54 patents)

4.  Tadashi Keda (37 out of 37 patents)

5.  Yoshio Noguchi (35 out of 40 patents)

6.  Shuhei Kageyama (27 out of 28 patents)

7.  Tadao Odaka (13 out of 15 patents)

8.  Tomoaki Suzuki (13 out of 13 patents)

9.  Youichi Nakazato (12 out of 13 patents)

10.  Takahiko Suzuki (12 out of 12 patents)

11.  Tadashi Yamamoto (11 out of 11 patents)

12.  Osamu Takahashi (11 out of 11 patents)

13.  Tomiji Ueki (11 out of 11 patents)

14.  Sachio Arai (10 out of 12 patents)

15.  Tadayoshi Ebinuma (10 out of 11 patents)


Core Competencies:
Ballpoint Pen
Mechanical Pencil
Writing Instrument
Dispenser
Cap Structure
Ink Composition
Liquid Container
Composite Tool
Clip Structure
Lead Cartridge
Fluid Container
Airtight Cap

294 patents:

1. 12090777 - Writing instrument refills and writing instrument (2024-09-17),
2. D1010002 - Ballpoint pen (2024-01-02),
3. D995628 - Ballpoint pen (2023-08-15),
4. 11660905 - Ball pen tip manufacturing machines, ball pen tips, and ball pens (2023-05-30),
5. 11390109 - Mechanical pencil (2022-07-19),
6. 11090969 - Mechanical pencil (2021-08-17),
7. 11065907 - Hand tools, cosmetic devices and writing instruments (2021-07-20),
8. D908796 - Sleeve for a mechanical pencil (2021-01-26),
9. 10836204 - Methods for manufacturing ball pen tips, ball pen tip manufacturing machines, ball pen tips and ball pens (2020-11-17),
10. 10828654 - Fluid container (2020-11-10),
11. D895729 - Mechanical pencil (2020-09-08),
12. D895728 - Ballpoint pen (2020-09-08),
13. 10603948 - Mechanical pencil (2020-03-31),
14. 10589563 - Composite writing implement (2020-03-17),
15. D871502 - Sleeve with cushion spring for mechanical pencil (2019-12-31),
Company Overview
Kotobuki Co., Ltd., based in Saitama, Japan, specializes in the development and manufacturing of writing instruments, including ballpoint pens and mechanical pencils. The company is recognized for its innovative approaches to ink composition, cap structures, and dispenser technologies, enhancing the functionality and user experience of its products. With a focus on precision and quality, Kotobuki continues to advance its core technologies, contributing to the writing instrument industry through research and development in composite tools and liquid containers.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

Kotobuki Co., Ltd. USPTO Patent Assignee Logo
294 Patents

#12 in Saitama

#550 in Japan

#3,042 in the World

Saitama, JP
Saitama, Japan

Kotobuki Co., Ltd.

Forward Citations = 3,700

62 inventors:

goldMedal Hidehei Kageyama (95 out of 105 patents)

silverMedal Hiromichi Izushima (53 out of 53 patents)

bronzeMedal Yoshihide Mitsuya (52 out of 54 patents)

4.  Tadashi Keda (37 out of 37 patents)

5.  Yoshio Noguchi (35 out of 40 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Kotobuki Co., Ltd.. Retrieved from https://idiyas.com/company/kotobuki-company

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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