EPO Patents = 36

Forward Citations = 2,751

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78 inventors (with patents filed for the assignee):

Katsumi Hasegawa (30 out of 34 patents)

Hiroyuki Nakasuka (17 out of 20 patents)

Jun Otsuka (11 out of 15 patents)

4. Masahiro Endo (8 out of 8 patents)

5. Kazuyuki Hasebe (7 out of 7 patents)

6. Daisuke Haba (7 out of 7 patents)

7. Tatsuya Furuta (6 out of 6 patents)

8. Takahiro Takeshita (6 out of 6 patents)

9. Akira Sugawara (5 out of 7 patents)

10. Kengo Hashimoto (4 out of 4 patents)

11. Hiroshi Ohtsubo (4 out of 4 patents)

12. Hiroaki Miyazaki (4 out of 4 patents)

13. Tatsuya Saito (4 out of 6 patents)

14. Kazuhiko Isogimi (4 out of 4 patents)

15. Yoshihiro Wakayama (4 out of 4 patents)

Core Competencies:

Lacrimal Sac Incision Knife

Eyelash Curler Handle

Razor Head

Intimate Area Thinning Razor

Edged Tool Storage Device

Surgical Knife

Culinary Slicer

Electric Cutting-Tool Grinder

Safety Razor

Knife Case

Trocar

Kitchen Knife

166 patents: Sort by Forward Citations

1. D1105606 - Safety razor (2025-12-09),

2. 12458395 - Lacrimal sac incision knife (2025-11-04),

3. D1100335 - Eyelash curler handle (2025-10-28),

4. 12447642 - Knife case (2025-10-21),

5. D1083227 - Razor (2025-07-08),

6. 12354034 - Management server (2025-07-08),

7. 12233565 - Razor head (2025-02-25),

8. 12109718 - Razor head (2024-10-08),

9. 11945129 - Intimate area thinning razor (2024-04-02),

10. 11897155 - Razor (2024-02-13),

11. 11813761 - Handle bending razor (2023-11-14),

12. 11801611 - Package open knife and a package open knives pack (2023-10-31),

13. D948123 - Razor blade (2022-04-05),

14. 11279053 - Safety razor and blade unit for safety razor (2022-03-22),

15. 11247358 - Pivotal neck razor (2022-02-15),

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

166 Patents

#23 in

#777 in Japan

#4,842 in the World

JP

Kai R$d Center Co., Ltd.