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For the Inventor, By the Inventor

Tokyo, Japan

Nsk-Warner K.k.


USPTO Granted Patents = 368

% Expired Patents = 20.7


Forward Citations = 2,107

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205 inventors (with patents filed for the assignee):

goldMedal Yoshio Kinoshita (42 out of 48 patents)

silverMedal Kazuhiko Muramatsu (28 out of 31 patents)

bronzeMedal Hirobumi Shirataki (27 out of 31 patents)

4.  Tomoharu Ando (19 out of 20 patents)

5.  Tomoyuki Miyazaki (18 out of 19 patents)

6.  Hiroshi Yabe (16 out of 18 patents)

7.  Katsuyasu Ono (14 out of 44 patents)

8.  Masao Shoji (13 out of 13 patents)

9.  Yasuhide Takasu (12 out of 12 patents)

10.  Akira Iwano (11 out of 11 patents)

11.  Ritsuo Toya (11 out of 11 patents)

12.  Hirofumi Ogata (11 out of 11 patents)

13.  Osamu Kawai (11 out of 34 patents)

14.  Shigeki Umezawa (11 out of 23 patents)

15.  Takeo Ueda (11 out of 17 patents)


Core Competencies:
Clutch Device
One-Way Clutch
Wet Multi-Plate Clutch
Friction Plate
Roller-Type Clutch
Ratchet Type Clutch
Liquid Pressure Apparatus
Differentially Controllable Clutch
Lock-Up Mechanism
Starting Clutch
Phenol Resin
Contact Area Measurement

368 patents:

1. 12723627 - Electrolytic corrosion prevention member for rolling bearing and electrolytic corrosion prevention rolling bearing unit (2026-09-01),
2. 12680580 - Ratchet type clutch device (2026-07-14),
3. 12607230 - Electrolytic corrosion prevention member for rolling bearing and electrolytic corrosion prevention rolling bearing unit (2026-04-21),
4. 12504047 - Power transmission device (2025-12-23),
5. 12467509 - Ratchet type clutch device and vehicle drive device (2025-11-11),
6. 12253124 - Clutch device with claw member for selectively locking rings (2025-03-18),
7. 12234868 - Ratchet type one-way clutch apparatus (2025-02-25),
8. 12222011 - Clutch device (2025-02-11),
9. 12215746 - Ratchet type one-way clutch apparatus (2025-02-04),
10. 11512754 - Phenol resin for wet friction material, phenol resin composition, and wet friction material (2022-11-29),
11. 11512744 - Clutch apparatus (2022-11-29),
12. 11261923 - Clutch apparatus (2022-03-01),
13. 10995805 - Structure of ratchet type one-way clutch (2021-05-04),
14. 10823234 - Annular member stopping structure for friction engaging device (2020-11-03),
15. 10801561 - One way clutch (2020-10-13),
Company Overview
Nsk-Warner K.K., based in Tokyo, specializes in advanced clutch technology, focusing on the development and manufacturing of various clutch devices. The company is recognized for its expertise in one-way clutches, wet multi-plate clutches, and friction plates, catering to diverse applications in automotive and industrial sectors. With a commitment to innovation, Nsk-Warner K.K. also explores technologies related to roller-type clutches, ratchet-type clutches, and liquid pressure apparatus, positioning itself as a key player in the clutch technology landscape.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

368 Patents

#231 in Tokyo

#463 in Japan

#2,501 in the World

Tokyo, JP
Tokyo, Japan

Nsk-Warner K.k.

Forward Citations = 2,107

205 inventors:

goldMedal Yoshio Kinoshita (42 out of 48 patents)

silverMedal Kazuhiko Muramatsu (28 out of 31 patents)

bronzeMedal Hirobumi Shirataki (27 out of 31 patents)

4.  Tomoharu Ando (19 out of 20 patents)

5.  Tomoyuki Miyazaki (18 out of 19 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nsk-Warner K.k.. Retrieved from https://idiyas.com/company/nsk-warner-k-k

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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