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Nkk Corporation

USPTO Granted Patents = 614

% Expired Patents = 2.3

EPO Patents = 1

Forward Citations = 5,928

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1,122 inventors (with patents filed for the assignee):

Tadashi Inoue (35 out of 42 patents)

Tomoyoshi Okita (25 out of 25 patents)

Masaaki Yamashita (24 out of 45 patents)

4. Toyofumi Watanabe (22 out of 25 patents)

5. Hiroaki Nishio (20 out of 37 patents)

6. Yoshihiro Hosoya (18 out of 25 patents)

7. Kiyoshi Tsuru (17 out of 17 patents)

8. Giichi Matsuo (16 out of 18 patents)

9. Toshiaki Urabe (16 out of 19 patents)

10. Haruyoshi Tanabe (15 out of 16 patents)

11. Hiroshi Kagechika (14 out of 17 patents)

12. Masahiro Kawakami (14 out of 16 patents)

13. Katsuhiro Iwasaki (14 out of 17 patents)

14. Kuninori Minakawa (14 out of 15 patents)

15. Yasunori Yoshie (14 out of 15 patents)

Core Competencies:

Hot-Dip Galvanizing

Cold-Rolled Steel Sheet

Defect Marking

Steel Sheet

High Strength Steel

Manufacturing Method

Galvanized Steel

Continuous Casting

Thermal Treatment

Wastewater Treatment

Metal Coating

Processing Techniques

614 patents: Sort by Forward Citations

1. 7599052 - Method for marking defect and device therefor (2009-10-06),

2. 7448430 - Manufacturing method for continuously cast product of steel (2008-11-11),

3. 7423744 - Method for marking defect and device therefor (2008-09-09),

4. 7361385 - Method for manufacturing hot-dip plated metal strip and apparatus for manufacturing the same (2008-04-22),

5. 7252722 - Steel sheet (2007-08-07),

6. 7248366 - Method for marking defect and device therefor (2007-07-24),

7. RE39475 - Digitizer having flat tablet with magnetic shield plate (2007-01-22),

8. 7156148 - Manufacturing method for continuously cast product of steel (2007-01-02),

9. 7137283 - Plate reduction press apparatus and methods (2006-11-21),

10. 6896035 - Manufacturing method for continuously cast product of steel (2005-05-24),

11. 6887820 - Method for producing optically active compounds (2005-05-03),

12. 6880619 - HEAT TREATING PLANT, INSTALLATION METHOD FOR POROUS REGENERATIVE ELEMENT, PRODUCTION METHOD FOR HEAT TREATED SUBSTANCE, SELECTION METHOD FOR POROUS REGENERATIVE ELEMENT, AND SPENT POROUS REGENERATIVE ELEMENT COMPONENT MEMBER (2005-04-19),

13. 6869691 - High strength hot-dip galvanized steel sheet and method for manufacturing the same (2005-03-22),

14. 6843843 - Underwater immersion block and method to produce the same (2005-01-18),

15. 6837916 - Smelting reduction method (2005-01-04),

Company Overview

Nkk Corporation, headquartered in Tokyo, specializes in the steel manufacturing sector, focusing on advanced processes such as hot-dip galvanizing and the production of cold-rolled steel sheets. The company is recognized for its expertise in high-strength steel and innovative manufacturing methods that enhance the quality and durability of galvanized steel products. Nkk Corporation's commitment to continuous casting technology positions it as a key player in the steel industry, catering to diverse applications and contributing to advancements in material science.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

614 Patents

#157 in Tokyo

#326 in Japan

#1,600 in the World

Nkk Corporation

Forward Citations = 5,928

1,122 inventors:

Tadashi Inoue (35 out of 42 patents)

Tomoyoshi Okita (25 out of 25 patents)

Masaaki Yamashita (24 out of 45 patents)

4. Toyofumi Watanabe (22 out of 25 patents)

5. Hiroaki Nishio (20 out of 37 patents)

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

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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