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Aichi-ken, Japan

The Pilot Ink Co., Ltd.

USPTO Granted Patents = 175

CIPO Patents = 2

EPO Patents = 46

Trademarks = 2

Forward Citations = 2,677

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121 inventors (with patents filed for the assignee):

Yutaka Shibahashi (23 out of 25 patents)

Yoshiaki Ono (20 out of 21 patents)

Akio Nakashima (18 out of 18 patents)

4. Katsuyuki Fujita (18 out of 18 patents)

5. Kuniyuki Senga (15 out of 16 patents)

6. Tsutomu Kito (13 out of 16 patents)

7. Norikazu Nakasuji (10 out of 12 patents)

8. Hiroshi Inagaki (9 out of 62 patents)

9. Michiyuki Yasuda (9 out of 9 patents)

10. Nobuo Sekine (9 out of 9 patents)

11. Masashi Ando (9 out of 23 patents)

12. Hideaki Asami (8 out of 8 patents)

13. Tsutomu Tomatsu (8 out of 8 patents)

14. Takao Inaba (7 out of 7 patents)

15. Shigeru Oike (7 out of 7 patents)

Core Competencies:

Thermochromic Composition

Photochromic Composition

Reversibly Thermochromic Ink

Electrophotographic Toner

Writing Instrument

Water-Based Ink Composition

Color-Memory Microcapsule Pigment

Multi-Refill Writing Instrument

Friction Body

Direct-Fluid-Supply Writing Implement

Reversible Thermal Discoloration

Water-Discoloring Drawing Toy

175 patents: Sort by Forward Citations

1. 12460099 - Reversibly thermochromic composition, reversibly thermochromic microcapsule pigment encapsulating reversibly thermochromic composition, and writing instrument using reversibly thermochromic microcapsule pigment (2025-11-04),

2. 12139623 - Oil-based ink composition for writing board and marking pen incorporating same (2024-11-12),

3. 12098289 - Photochromic composition (2024-09-24),

4. 12083782 - Discoloring body having glossiness (2024-09-10),

5. 12011943 - Image forming apparatus (2024-06-18),

6. 11738589 - Writing instrument (2023-08-29),

7. 11267978 - Reversibly thermochromic aqueous ink composition and writing instrument using the same (2022-03-08),

8. 11179963 - Writing instrument (2021-11-23),

9. 11060018 - Reversibly thermochromic composition and reversibly thermochromic microcapsule pigment encapsulating the same (2021-07-13),

10. 11015076 - Ink composition for reversibly thermochromic stamp and stamp (2021-05-25),

11. 10493791 - Writing instrument (2019-12-03),

12. 10358570 - Thermochromic color-memory composition and thermochromic color-memory microcapsule pigment encapsulating same (2019-07-23),

13. 9937434 - Photochromic toy (2018-04-10),

14. 9933721 - Electrophotographic toner and method for producing the same (2018-04-03),

15. 9855789 - Thermochromic color-memorizing composition and thermochromic color-memorizing microcapsule pigment encapsulating same (2018-01-02),

THE PILOT INK CO., LTD. is a leading manufacturer and supplier of high-quality ink products. With over 50 years of experience, we have established ourselves as a trusted brand among artists, writers, and professionals. Our extensive range of inks caters to diverse needs, including calligraphy, drawing, and writing. We are committed to innovation and constantly strive to develop new and improved ink formulas. Our products are known for their vibrant colors, longevity, and optimal performance. Visit our website to explore our wide range of ink products and find the perfect ink for your artistic or professional needs.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

175 Patents

#3 in Aichi-ken

#753 in Japan

#4,625 in the World

Aichi-ken, Japan

The Pilot Ink Co., Ltd.

Forward Citations = 2,677

121 inventors:

Yutaka Shibahashi (23 out of 25 patents)

Yoshiaki Ono (20 out of 21 patents)

Akio Nakashima (18 out of 18 patents)

4. Katsuyuki Fujita (18 out of 18 patents)

5. Kuniyuki Senga (15 out of 16 patents)

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