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Nippon Tungsten Co., Ltd.

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USPTO Granted Patents = 57

% Expired Patents = 19.3

EPO Patents = 6

Forward Citations = 377

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145 inventors (with patents filed for the assignee):

Michito Miyahara (17 out of 20 patents)

Mitsuhiko Furukawa (17 out of 17 patents)

Toshiaki Wada (11 out of 27 patents)

4. Masaharu Shiroyama (11 out of 11 patents)

5. Mitsuyoshi Nagano (10 out of 10 patents)

6. Takashi Kitahira (10 out of 10 patents)

7. Yusuke Hara (6 out of 6 patents)

8. Shigeya Sakaguchi (6 out of 6 patents)

9. Toyoshige Sasaki (6 out of 6 patents)

10. Kiyohito Misumi (6 out of 6 patents)

11. Osamu Nakano (6 out of 6 patents)

12. Shigeki Mohri (6 out of 6 patents)

13. Shigeru Matsuo (4 out of 4 patents)

14. Hiroshi Ito (3 out of 17 patents)

15. Kenji Fujimoto (3 out of 3 patents)

Core Competencies:

Plasma Processing

Sintered Bodies

Magnetic Head Sliders

Thin-Film Substrates

Tungsten Cathode

Ceramic Materials

Cutting Tools

Electrostatic Chucks

Composite Powders

High-Density Materials

LED Production

Metal Carbide Particles

57 patents: Sort by Forward Citations

1. 11548827 - Member for plasma processing apparatus and plasma processing apparatus with the same (2023-01-10),

2. 11434174 - Member for plasma processing apparatus, plasma processing apparatus with the same and method for using sintered body (2022-09-06),

3. 11309454 - Deep ultraviolet LED and method for producing the same (2022-04-19),

4. 10859088 - Sliding material, shaft sleeve, and pump provided with shaft sleeve (2020-12-08),

5. 10493649 - Anvil roll, rotary cutter, and method for cutting workpiece (2019-12-03),

6. 10391663 - Roll for rotary cutter and rotary cutter (2019-08-27),

7. 9773652 - MgO target for sputtering (2017-09-26),

8. 9293156 - Substrates for thin-film magnetic heads, magnetic head sliders, and hard disk drive devices (2016-03-22),

9. 9293155 - Substrates for thin-film magnetic heads, magnetic head sliders, and hard disk drive devices (2016-03-22),

10. 9293154 - Substrates for thin-film magnetic heads, magnetic head sliders, and hard disk drive devices (2016-03-22),

11. 9120704 - Dielectric layer for electrostatic chuck and electrostatic chuck (2015-09-01),

12. 9079800 - Composite ceramic body, and component member for semiconductor manufacturing apparatus (2015-07-14),

13. 8758652 - Tungsten cathode material (2014-06-24),

14. 8486529 - Fine metal carbide particles and methods of manufacturing the same (2013-07-16),

15. 8471169 - Electrode for spot welding (2013-06-25),

Company Overview

Nippon Tungsten Co., Ltd., based in Fukuoka, Japan, specializes in advanced plasma processing technology and the development of high-performance materials. The company focuses on producing sintered bodies, magnetic head sliders, and thin-film substrates, leveraging its expertise in tungsten cathodes and ceramic materials. Additionally, Nippon Tungsten is known for its cutting tools and electrostatic chucks, catering to various industries that require precision and reliability in manufacturing processes.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Nov 3 2026

57 Patents

#8 in Fukuoka

#1,591 in Japan

#12,580 in the World

Nippon Tungsten Co., Ltd.

Forward Citations = 377

145 inventors:

Michito Miyahara (17 out of 20 patents)

Mitsuhiko Furukawa (17 out of 17 patents)

Toshiaki Wada (11 out of 27 patents)

4. Masaharu Shiroyama (11 out of 11 patents)

5. Mitsuyoshi Nagano (10 out of 10 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nippon Tungsten Co., Ltd.. Retrieved from https://idiyas.com/company/nippon-tungsten-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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