% Expired Patents = 25.0

EPO Patents = 3

Forward Citations = 0

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8 inventors (with patents filed for the assignee):

Yusuke Minami (4 out of 8 patents)

Shuji Hashizume (3 out of 5 patents)

Tatsuo Ono (2 out of 5 patents)

4. Toshihiko Fukui (1 out of 4 patents)

5. Motohisa Yoshida (1 out of 2 patents)

6. Tomomi Taniguchi (1 out of 1 patent)

7. Yu Yamamoto (1 out of 1 patent)

8. Hitoshi Iijima (1 out of 29 patents)

9. Tomoyuki Narikawa (1 patent)

10. Nobuhide Sato (1 patent)

11. Koji Sakura (0 patent)

4 patents: Sort by Forward Citations

1. 9677160 - Low C-high Cr 862 MPa-class steel tube having excellent corrosion resistance and a manufacturing method thereof (2017-06-13),

2. 9284634 - Martensitic stainless steel having excellent corrosion resistance (2016-03-15),

3. 8747575 - 655 MPa grade martensitic stainless steel having high toughness and method for manufacturing the same (2014-06-10),

4. 8034198 - Austenitic stainless steel tube for boiler with excellent resistance to high temperature steam oxidation (2011-10-11),

Company Overview

Nkk Tubes is a leading manufacturer of stainless steel and high-alloy tube products. With over 100 years of experience, we provide precision tubes for various industries including oil and gas, petrochemical, and power generation. Our commitment to quality and innovation has made us a trusted supplier in the global market.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

4 Patents

#86 in Kawasaki

#7,579 in Japan

Kawasaki, Japan

Nkk Tubes

Forward Citations = 0

8 inventors:

Yusuke Minami (4 out of 8 patents)

Shuji Hashizume (3 out of 5 patents)

Tatsuo Ono (2 out of 5 patents)

4. Toshihiko Fukui (1 out of 4 patents)

5. Motohisa Yoshida (1 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Nkk Tubes. Retrieved from https://idiyas.com/company/nkk-tubes

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]

3 patents (EPO):

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]