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Showa Denko K.k.

Calculating rank

USPTO Granted Patents = 1,961

% Expired Patents = 35.6

CIPO Patents = 21

EPO Patents = 533

Trademarks = 11

Forward Citations = 10,855

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1,751 inventors (with patents filed for the assignee):

Kazumi Naito (86 out of 112 patents)

Takashi Udagawa (52 out of 74 patents)

Ryuji Monden (48 out of 60 patents)

4. Hiroshi Uchida (43 out of 71 patents)

5. Akira Sakawaki (43 out of 60 patents)

6. Hisayuki Miki (42 out of 56 patents)

7. Hiromoto Ohno (40 out of 43 patents)

8. Masataka Takeuchi (39 out of 47 patents)

9. Toshio Ohi (37 out of 39 patents)

10. Katsumi Murofushi (34 out of 44 patents)

11. Masato Fukushima (32 out of 107 patents)

12. Naohisa Higashiyama (30 out of 42 patents)

13. Tetsuya Kanbe (29 out of 29 patents)

14. Hiroshi Sakai (29 out of 72 patents)

15. Yasuaki Wakizaka (28 out of 28 patents)

Core Competencies:

Silicon Carbide

Aluminum Alloys

Magnetic Sensors

Crystal Growth

Lithium Ion Batteries

Conducting Films

Electrolytic Capacitors

Carbon Fiber

Fluorine Compounds

N-type Substrates

Organic EL Elements

Gas Supply Methods

1,961 patents: Sort by Forward Citations

1. 12709714 - GASIFICATION FURNACE OPERATING METHOD AND GASIFICATION FURNACE (2026-08-18),

2. 12190032 - Material design device, material design method, and material design program (2025-01-07),

3. 12134805 - Aluminum alloy member for forming fluoride film thereon and aluminum alloy member having fluoride film (2024-11-05),

4. 12054811 - Aluminum alloy member for forming fluoride film and aluminum alloy member having fluoride film (2024-08-06),

5. 11906569 - Semiconductor wafer evaluation apparatus and semiconductor wafer manufacturing method (2024-02-20),

6. 11777082 - Negative electrode material for lithium ion secondary batteries, method for manufacturing the same, paste for negative electrode, negative electrode sheet, and lithium ion secondary (2023-10-03),

7. D997802 - Bumper reinforcement for automobile (2023-09-05),

8. 11739405 - Production method of Al—Mg—Si series aluminum alloy forged product (2023-08-29),

9. 11733319 - Magnetic sensor (2023-08-22),

10. 11721493 - Liquid dispersion composition for solid electrolytic capacitor production (2023-08-08),

11. 11719768 - Magnetic sensor and magnetic sensor device (2023-08-08),

12. 11719767 - Magnetic sensor (2023-08-08),

13. 11718579 - Method for producing highly polymerizable N-vinyl carboxylic acid amide monomer (2023-08-08),

14. 11710581 - Transparent conducting film laminate and processing method thereof (2023-07-25),

15. 11708646 - Crucible having an improved crystal growth base for manufacturing silicon carbide single crystal and method of use (2023-07-25),

Company Overview

Showa Denko K.K., headquartered in Tokyo, Japan, is a leading manufacturer specializing in advanced materials and technologies, particularly in silicon carbide technology. The company focuses on developing high-performance products such as aluminum alloys, magnetic sensors, and conducting films, which are integral to various industries including electronics and automotive. Additionally, Showa Denko is involved in the production of lithium-ion batteries, electrolytic capacitors, and carbon fiber, contributing to innovations in energy storage and lightweight materials.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

1,961 Patents

#67 in Tokyo

#123 in Japan

#519 in the World

Showa Denko K.k.

Forward Citations = 10,855

1,751 inventors:

Kazumi Naito (86 out of 112 patents)

Takashi Udagawa (52 out of 74 patents)

Ryuji Monden (48 out of 60 patents)

4. Hiroshi Uchida (43 out of 71 patents)

5. Akira Sakawaki (43 out of 60 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Showa Denko K.k.. Retrieved from https://idiyas.com/company/showa-denko-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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