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For the Inventor, By the Inventor

Yokohama, Japan

Nhk Spring Co., Ltd.

Calculating rank
USPTO Granted Patents = 1,234

% Expired Patents = 18.6



Trademarks = 14

Forward Citations = 9,804

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1,101 inventors (with patents filed for the assignee):

goldMedal Toshio Kazama (54 out of 54 patents)

silverMedal Masao Hanya (53 out of 56 patents)

bronzeMedal Juji Ojima (47 out of 48 patents)

4.  Shigeru Kuroda (39 out of 39 patents)

5.  Hidekazu Hoshino (39 out of 40 patents)

6.  Hajime Arai (34 out of 34 patents)

7.  Itsuo Takeuchi (30 out of 31 patents)

8.  Hiroyoshi Yamaguchi (30 out of 32 patents)

9.  Yoshiharu Kitamura (29 out of 31 patents)

10.  Toshiki Ando (25 out of 25 patents)

11.  Akira Tange (23 out of 141 patents)

12.  Yukie Yamada (23 out of 24 patents)

13.  Noritoshi Takamura (23 out of 24 patents)

14.  Yoshiki Ono (21 out of 22 patents)

15.  Hiroshi Nakayama (20 out of 67 patents)


Core Competencies:
Vehicle Seat
Cushion Skin
Seat Frame
Bending Structure
Head Driving Device
Spring Member
Coil Spring Device
Flexible Member
Probe Unit
Watercraft Control
Disc Drive Suspension
Manufacturing Method

1,234 patents:

1. 12503342 - Hoist hook and transporting method of article using the hoist hook (2025-12-23),
2. 12498396 - Probe unit (2025-12-16),
3. 12484144 - Circuit pattern, semi-finished base material for circuit substrate, metal-based circuit substrate, production method for circuit pattern, and production device for circuit pattern (2025-11-25),
4. 12482495 - Head driving device configured to move a head member relative to tape as a recording medium and configured to stably hold the head member (2025-11-25),
5. 12482490 - Tape drive device and method of detecting state of head unit of tape drive device (2025-11-25),
6. 12473955 - Coil spring device (2025-11-18),
7. 12472696 - Bonding method (2025-11-18),
8. 12466088 - Bending structural body (2025-11-11),
9. 12459627 - Steering handle device for vessel (2025-11-04),
10. 12459410 - Seatback of vehicle seat (2025-11-04),
11. 12459139 - Bending structure and joint function part (2025-11-04),
12. 12448105 - Automatic watercraft maneuvering system, watercraft control device, watercraft control method, and recording medium (2025-10-21),
13. 12442425 - Spring member (2025-10-14),
14. 12441220 - Vehicle seat (2025-10-14),
15. 12441216 - Car sickness inhibition device, method, storage medium, and vehicle seat (2025-10-14),
Company Overview
Nhk Spring Co., Ltd., headquartered in Yokohama, Japan, specializes in advanced vehicle seat technology, focusing on the development and manufacture of components that enhance comfort and safety in automotive seating. The company is recognized for its expertise in various core technologies, including seat frames, cushion skins, and flexible members, which contribute to innovative seating solutions. With a commitment to quality and innovation, Nhk Spring plays a significant role in the automotive industry, addressing the evolving needs of vehicle manufacturers.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

1,234 Patents

#6 in Yokohama

#191 in Japan

#823 in the World

Yokohama, JP
Yokohama, Japan

Nhk Spring Co., Ltd.

Forward Citations = 9,804

1,101 inventors:

goldMedal Toshio Kazama (54 out of 54 patents)

silverMedal Masao Hanya (53 out of 56 patents)

bronzeMedal Juji Ojima (47 out of 48 patents)

4.  Shigeru Kuroda (39 out of 39 patents)

5.  Hidekazu Hoshino (39 out of 40 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nhk Spring Co., Ltd.. Retrieved from https://idiyas.com/company/nhk-spring-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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