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The Sailor Pen Co., Ltd.

USPTO Granted Patents = 18

Trademarks = 2

Forward Citations = 139

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29 inventors (with patents filed for the assignee):

Hideshi Okamoto (3 out of 4 patents)

Kiyoto Shigematsu (2 out of 2 patents)

Isao Shimada (2 out of 2 patents)

4. Isao Inagaki (2 out of 2 patents)

5. Hirofumi Hamamoto (2 out of 2 patents)

6. Yasuhiro Masumoto (2 out of 2 patents)

7. Kazuhiko Osaki (2 out of 2 patents)

8. Kazushige Matsumuro (2 out of 2 patents)

9. Fumio Kobayashi (1 out of 2 patents)

10. Yoshiyuki Sunaga (1 out of 3 patents)

11. Koji Matsuo (1 out of 16 patents)

12. Ichiro Morimoto (1 out of 2 patents)

13. Eiji Hishinuma (1 out of 1 patent)

14. Toshiaki Tanaka (1 out of 12 patents)

15. Koichi Murakawa (1 out of 1 patent)

18 patents: Sort by Forward Citations

1. 12285967 - Writing instrument and pen tip part (2025-04-29),

2. 6499363 - Tip for pipette and pipette with the same (2002-12-31),

3. 6056463 - Aqueous ballpoint pen refill and process for producing the same (2000-05-02),

4. 6021680 - Pipette (2000-02-08),

5. 5542771 - Applicator having cap which pressurizes and seals inner space (1996-08-06),

6. 5462379 - Applicator having cap which pressurizes and seals inner space (1995-10-31),

7. 5421664 - Fluid applicator with fluid tank pressurization device (1995-06-06),

8. 5362169 - Applicator having cap which pressurizes inner space (1994-11-08),

9. 5277510 - Applicator with spring biased ball (1994-01-11),

10. 4976560 - Mechanical pencil with a plastic chuck (1990-12-11),

11. D281512 - Nib for a fountain pen (1985-11-26),

12. 4547947 - Method for producing a nondirectional pen (1985-10-22),

13. 4547946 - Method for producing a nondirectional pen (1985-10-22),

14. D272364 - Combined decoration stamp and cap (1984-01-24),

15. D272363 - Combined decoration stamp and cap (1984-01-24),

The Sailor Pen Co., Ltd. is a Japanese company that specializes in the manufacturing of high-quality writing instruments. Founded in 1911, Sailor pens are known for their precision craftsmanship and smooth writing experience. The company offers a wide range of fountain pens, ballpoint pens, rollerball pens, and accessories. Sailor pens are popular among professionals, pen enthusiasts, and collectors worldwide.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

18 Patents

#1,227 in Tokyo

#3,053 in Japan

#33,166 in the World

The Sailor Pen Co., Ltd.

Forward Citations = 139

29 inventors:

Hideshi Okamoto (3 out of 4 patents)

Kiyoto Shigematsu (2 out of 2 patents)

Isao Shimada (2 out of 2 patents)

4. Isao Inagaki (2 out of 2 patents)

5. Hirofumi Hamamoto (2 out of 2 patents)

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