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For the Inventor, By the Inventor

Saitama, Japan

Kotobuki Co., Ltd.


USPTO Granted Patents = 294


Trademarks = 6

Forward Citations = 3,674

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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:
Writing Instruments
Ballpoint Pens
Mechanical Pencils
Ball Pen Tips
Fluid Containers
Cosmetic Devices
Liquid Applicators
Ink Compositions
Propelling Containers
Manufacturing Machines
Clip Attachment Structures
Lead Cartridges

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),
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USPTO Data Jan 1 1976 - Jan 6 2026

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294 Patents

#7 in Saitama

#533 in Japan

#2,950 in the World

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Saitama, Japan

Kotobuki Co., Ltd.

Forward Citations = 3,674

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)

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