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For the Inventor, By the Inventor

Saitama, Japan

Showa Corporation

USPTO Granted Patents = 438

% Expired Patents = 33.1



Trademarks = 16

Forward Citations = 2,395

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303 inventors (with patents filed for the assignee):

goldMedal Yosuke Murakami (48 out of 64 patents)

silverMedal Fumiaki Ishikawa (19 out of 20 patents)

bronzeMedal Hayato Tsutsui (19 out of 27 patents)

4.  Takahiro Kasuga (18 out of 22 patents)

5.  Toshio Nishikawa (17 out of 17 patents)

6.  Tamotsu Nakamura (17 out of 17 patents)

7.  Shunya Senda (13 out of 13 patents)

8.  Hiroyuki Miyata (11 out of 14 patents)

9.  Yohei Hama (11 out of 11 patents)

10.  Kazuhiro Miwa (10 out of 10 patents)

11.  Takahiko Saito (10 out of 10 patents)

12.  Koichi Hata (10 out of 11 patents)

13.  Mitsuo Saito (10 out of 15 patents)

14.  Hiroshi Fujita (9 out of 15 patents)

15.  Tatsuya Saito (9 out of 9 patents)


Core Competencies:
Shock Absorber
Hydraulic Damping Device
Vehicle Height Adjustment
Suspension Controller
Vane Pump Device
Outboard Motor
Steering Device
Damping Force Variable
Pressure Damping Device
Trim and Tilt Device
Motor Drive Device
Suspension Apparatus

438 patents:

1. 11254353 - Control device and steering device (2022-02-22),
2. 11247685 - Road surface determination device, suspension control device, and suspension device (2022-02-15),
3. 11199238 - Hydraulic damping device (2021-12-14),
4. 11155929 - Masking jig and electroplating apparatus (2021-10-26),
5. 11149815 - Shock absorber (2021-10-19),
6. 11110912 - Vehicle control device, and vehicle (2021-09-07),
7. 11104372 - Vehicle steering device (2021-08-31),
8. 11098780 - Suspension (2021-08-24),
9. 11084371 - Motor drive device (2021-08-10),
10. 11027811 - Outboard motor lifting device (2021-06-08),
11. 10975895 - Piston structure body and lifting device of watercraft propulsion apparatus (2021-04-13),
12. 10974803 - Steering device and watercraft steering device (2021-04-13),
13. 10968975 - Hydraulic damping device (2021-04-06),
14. 10935099 - Outboard engine lifting/lowering device and outboard engine (2021-03-02),
15. 10919597 - Vehicle height adjustment device (2021-02-16),
Company Overview
Showa Corporation, headquartered in Saitama, Japan, specializes in the development and manufacturing of advanced vehicle suspension systems. The company is recognized for its innovative technologies, including shock absorbers, hydraulic damping devices, and suspension controllers, which enhance vehicle performance and comfort. Showa's expertise extends to vehicle height adjustment systems and damping force variability, contributing to improved driving dynamics. Additionally, the company is involved in the production of outboard motors and steering devices, showcasing its diverse engineering capabilities in the automotive sector.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

Showa Corporation USPTO Patent Assignee Logo
438 Patents

#9 in Saitama 343-0827

#419 in Japan

#2,172 in the World

Saitama, JP
Saitama, Japan

Showa Corporation

Forward Citations = 2,395

303 inventors:

goldMedal Yosuke Murakami (48 out of 64 patents)

silverMedal Fumiaki Ishikawa (19 out of 20 patents)

bronzeMedal Hayato Tsutsui (19 out of 27 patents)

4.  Takahiro Kasuga (18 out of 22 patents)

5.  Toshio Nishikawa (17 out of 17 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Showa Corporation. Retrieved from https://idiyas.com/company/showa

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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