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For the Inventor, By the Inventor

Tokyo, Japan

Hitachi Koki Co., Ltd.

Calculating rank
USPTO Granted Patents = 1,267

% Expired Patents = 22.0


Trademarks = 3

Forward Citations = 22,307

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878 inventors (with patents filed for the assignee):

goldMedal Nobuhiro Takano (65 out of 74 patents)

silverMedal Masato Sakai (57 out of 57 patents)

bronzeMedal Masanori Okada (52 out of 55 patents)

4.  Tomomasa Nishikawa (49 out of 79 patents)

5.  Susumu Saito (45 out of 138 patents)

6.  Takeshi Taniguchi (43 out of 48 patents)

7.  Kazuhiko Funabashi (42 out of 66 patents)

8.  Katsuhiro Oomori (40 out of 40 patents)

9.  Shinki Ohtsu (39 out of 40 patents)

10.  Hideyuki Tanimoto (38 out of 44 patents)

11.  Yoshitaka Akiba (36 out of 36 patents)

12.  Chikai Yoshimizu (34 out of 36 patents)

13.  Akira Arimoto (33 out of 87 patents)

14.  Shigeharu Ushiwata (30 out of 30 patents)

15.  Haruhisa Fujisawa (29 out of 30 patents)


Core Competencies:
Centrifuge
Battery Pack
Electric Circular Saw
Portable Blower
Power Tool
Impact Tool
Electric Driver
Nailer
Engine
Air Compressor
Electric Device

1,267 patents:

1. D919560 - Storage battery (2021-05-18),
2. D850740 - Engine blower (2019-06-04),
3. D849795 - Engine (2019-05-28),
4. D849495 - Portable electric circular saw (2019-05-28),
5. D844681 - Table cutting machine (2019-04-02),
6. D844558 - Storage battery (2019-04-02),
7. D835962 - Portable nailing machine body (2018-12-18),
8. D831458 - Portable electric power sander (2018-10-23),
9. 10099303 - Electric power tool (2018-10-16),
10. D829523 - Portable electric power circular saw (2018-10-02),
11. 10086529 - Power planer configured to restrain heat generation of control portion (2018-10-02),
12. D826669 - Portable electric driver body (2018-08-28),
13. 10046335 - Centrifuge for pivoting the rotating shafts of the sample container and swing rotor for centrifuge (2018-08-14),
14. 10035253 - Portable work tool (2018-07-31),
15. D823659 - Portable electric nailer (2018-07-24),
Company Overview
Hitachi Koki Co., Ltd., based in Tokyo, specializes in the development and manufacturing of electric power tools. The company is recognized for its innovative technologies in various power tool segments, including impact tools, electric drivers, and nailers. Hitachi Koki also focuses on advanced battery pack solutions and portable equipment such as electric circular saws and blowers. With a commitment to quality and performance, the company serves both professional and consumer markets, enhancing productivity across diverse applications.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

1,267 Patents

#96 in Tokyo

#183 in Japan

#795 in the World

Tokyo, JP
Tokyo, Japan

Hitachi Koki Co., Ltd.

Forward Citations = 22,307

878 inventors:

goldMedal Nobuhiro Takano (65 out of 74 patents)

silverMedal Masato Sakai (57 out of 57 patents)

bronzeMedal Masanori Okada (52 out of 55 patents)

4.  Tomomasa Nishikawa (49 out of 79 patents)

5.  Susumu Saito (45 out of 138 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hitachi Koki Co., Ltd.. Retrieved from https://idiyas.com/company/hitachi-koki-company

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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