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For the Inventor, By the Inventor

Tokyo, Japan

Mitsubishi Pencil Kabushiki Kaisha


USPTO Granted Patents = 196



Forward Citations = 2,040

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128 inventors (with patents filed for the assignee):

goldMedal Kazuhiko Furukawa (30 out of 41 patents)

silverMedal Masaru Miyamoto (20 out of 28 patents)

bronzeMedal Seiichi Kobayashi (13 out of 72 patents)

4.  Yoji Takeuchi (12 out of 19 patents)

5.  Takahiro Osada (12 out of 21 patents)

6.  Tadashi Kamagata (11 out of 11 patents)

7.  Shigeru Miyazaki (10 out of 11 patents)

8.  Yojiro Sano (10 out of 10 patents)

9.  Katsuhiko Shiraishi (9 out of 9 patents)

10.  Yoichi Ando (9 out of 9 patents)

11.  Takao Koyama (8 out of 12 patents)

12.  Kazuhiro Ami (8 out of 8 patents)

13.  Kazuaki Matsumoto (7 out of 10 patents)

14.  Kiyoshi Iwamoto (6 out of 14 patents)

15.  Hiroaki Koyama (6 out of 11 patents)


Core Competencies:
Writing Instrument
Ball-Point Pen
Water-Based Ink Composition
Cosmetic Applicator
Direct Methanol Fuel Cell
Ink Composition
Cartridge Type Applicator
Sintered Color Pencil Lead
Liquid Applicator
Safety Indwelling Needle
Collector Type Writing Implement
Baked Colored Pencil Lead

196 patents:

1. 8684617 - Writing instrument (2014-04-01),
2. 8206051 - Cosmetic-containing applicator and replacement brush (2012-06-26),
3. 7862249 - Ball-point pen tip and ink refill (2011-01-04),
4. 7625656 - Direct methanol fuel cell (2009-12-01),
5. 7556877 - Direct methanol fuel cell (2009-07-07),
6. 7503718 - Cosmetic container (2009-03-17),
7. 7381004 - Gas pressurized writing instrument and writing instrument refill (2008-06-03),
8. 7345100 - Water-based ink composition for ball-point pen (2008-03-18),
9. 7325992 - Gas-pressurized writing instrument and writing instrument refill (2008-02-05),
10. 7311459 - Follower for non-aqueous ball point pen and non-aqueous ball point pen (2007-12-25),
11. 7303351 - Writing instrument and welding method of writing point assembly and writing instrument parts connecting structure and connecting method (2007-12-04),
12. 7279512 - Water-based ink composition for ballpoint pen (2007-10-09),
13. 7223037 - Production processes for writing instrument and ink occlusion body (2007-05-29),
14. 7179005 - Ink follower for water-based ink ballpoint pen (2007-02-20),
15. 7153052 - Writing implement (2006-12-26),
Mitsubishi Pencil Kabushiki Kaisha is a Japanese company that specializes in manufacturing and distributing various writing instruments. Founded in 1887, the company is known for its high-quality pens, pencils, markers, and other stationery products. With a commitment to innovation and craftsmanship, Mitsubishi Pencil has established a strong presence in both domestic and international markets. Their products are widely recognized for their durability, precision, and smooth writing experience.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Dec 23 2025

196 Patents

#312 in Tokyo

#694 in Japan

#4,181 in the World

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Tokyo, Japan

Mitsubishi Pencil Kabushiki Kaisha

Forward Citations = 2,040

128 inventors:

goldMedal Kazuhiko Furukawa (30 out of 41 patents)

silverMedal Masaru Miyamoto (20 out of 28 patents)

bronzeMedal Seiichi Kobayashi (13 out of 72 patents)

4.  Yoji Takeuchi (12 out of 19 patents)

5.  Takahiro Osada (12 out of 21 patents)

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