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Hitachi Seiko, Ltd.

USPTO Granted Patents = 60

Forward Citations = 738

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83 inventors (with patents filed for the assignee):

Yasuhiko Kanaya (23 out of 26 patents)

Kunio Arai (14 out of 27 patents)

Tamio Otani (11 out of 15 patents)

4. Tamio Ohtani (6 out of 6 patents)

5. Takahiro Yamada (4 out of 62 patents)

6. Hiroshi Aoyama (4 out of 11 patents)

7. Eiji Yoshino (4 out of 7 patents)

8. Yasumasa Matsuda (4 out of 34 patents)

9. Toshiyuki Makino (4 out of 4 patents)

10. Takeshi Araya (4 out of 17 patents)

11. Akira Irie (4 out of 7 patents)

12. Kiyoharu Nakajima (3 out of 5 patents)

13. Shigeru Kakumoto (3 out of 14 patents)

14. Masao Nishigai (3 out of 4 patents)

15. Hiromi Nishiyama (3 out of 3 patents)

Core Competencies:

Drill Bit

Welding Method

CNC Apparatus

Grinding Machine

Printed Circuit Board

Tool Detection

Electrode Control

Ink-Jet Recording

Servo Control

Automated Machining

Electrolytic Grinding

Spot Facing

60 patents: Sort by Forward Citations

1. 5888036 - Drill bit and step feeding method (1999-03-30),

2. 5876156 - Printed-circuit board holding device (1999-03-02),

3. 5824991 - Pulsed arc welding method and apparatus (1998-10-20),

4. 5756378 - Method of and apparatus for laser processing (1998-05-26),

5. 5390446 - Grinding method and grinding machine (1995-02-21),

6. 5349159 - Consumable-electrode AC gas shield arc welding method and apparatus (1994-09-20),

7. 5332341 - Pressure foot of printed circuit board drilling apparatus (1994-07-26),

8. 5315072 - Printed wiring board having blind holes (1994-05-24),

9. 5266878 - CNC apparatus for controlling a plurality of machines (1993-11-30),

10. 5225660 - Consumable-electrode AC gas shield arc welding method and apparatus (1993-07-06),

11. 5220715 - Printed circuit board processing apparatus (1993-06-22),

12. 5214991 - Punching apparatus (1993-06-01),

13. 5205805 - Printed circuit board processing machine incorporating tool holding (1993-04-27),

14. 5200906 - Wire-cut electric discharge machining method (1993-04-06),

15. 5199830 - Printed circuit board presser device in drilling machine (1993-04-06),

Hitachi Seiko, Ltd., based in Tokyo, specializes in the development and manufacturing of advanced printed circuit boards. The company focuses on a range of core technologies including precision drilling, innovative welding methods, and CNC apparatuses, which are essential for modern electronics. Additionally, Hitachi Seiko is involved in the production of grinding machines and tools for effective electrode control and ink-jet recording, contributing significantly to the electronics and manufacturing sectors in Japan and beyond.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

60 Patents

#721 in Tokyo

#1,532 in Japan

#12,071 in the World

Hitachi Seiko, Ltd.

Forward Citations = 738

83 inventors:

Yasuhiko Kanaya (23 out of 26 patents)

Kunio Arai (14 out of 27 patents)

Tamio Otani (11 out of 15 patents)

4. Tamio Ohtani (6 out of 6 patents)

5. Takahiro Yamada (4 out of 62 patents)

Please report any incorrect information to [email protected]

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