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Itamishi, Japan

Sumitomo (Sei) Steel Wire Corp.

USPTO Granted Patents = 18

% Expired Patents = 33.3

Forward Citations = 26

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43 inventors (with patents filed for the assignee):

Kenichi Okamoto (6 out of 13 patents)

Nozomu Kawabe (5 out of 50 patents)

Hiromu Izumida (4 out of 14 patents)

4. Shinei Takamura (4 out of 9 patents)

5. Yuichi Sano (4 out of 5 patents)

6. Katsuhito Oshima (3 out of 9 patents)

7. Yoshihiko Touda (3 out of 4 patents)

8. Yasuo Sakai (3 out of 10 patents)

9. Toshihiko Niki (3 out of 3 patents)

10. Hitoshi Wakahara (3 out of 3 patents)

11. Teruyuki Murai (3 out of 35 patents)

12. Masato Yamada (2 out of 13 patents)

13. Junichi Kodama (2 out of 12 patents)

14. Jun Sugawara (2 out of 24 patents)

15. Shingo Nakajima (2 out of 12 patents)

18 patents: Sort by Forward Citations

1. 10323415 - Pregrouted PC steel material and curing method for pregrouted layer therein (2019-06-18),

2. 10081943 - Pregrouted PC steel material and method for hardening pregrout layer thereof (2018-09-25),

3. 9849531 - Electrode wire for wire electric discharge machining, and method for producing same (2017-12-26),

4. 9169403 - Powder coating composition for PC strand coating, coating method, and coating film (2015-10-27),

5. 8890516 - Tension measurement apparatus (2014-11-18),

6. 8833420 - Metal cord, rubber-cord complex and pneumatic tire using the same (2014-09-16),

7. 8833419 - Metal cord, rubber-cord complex and pneumatic tire using the same (2014-09-16),

8. 8657973 - Magnesium-based alloy wire and method of its manufacture (2014-02-25),

9. 8308878 - Magnesium-based alloy wire and method of its manufacture (2012-11-13),

10. 8080120 - Method and apparatus of manufacturing annular concentric stranded bead cord (2011-12-20),

11. 7886490 - Strand (2011-02-15),

12. 7861507 - High-strength prestressing strand, method for manufacturing the same, and concrete construction using the same (2011-01-04),

13. 7775028 - Annular metal cord and endless metal belt (2010-08-17),

14. 7735307 - Annular concentric-lay bead cord (2010-06-15),

15. 7717411 - High-strength stainless steel spring and method of manufacturing the same (2010-05-18),

Company Overview

Sumitomo (Sei) Steel Wire Corp. specializes in the development and manufacturing of high-quality steel wire products. The company is known for its expertise in producing various types of wire, including those used in automotive, construction, and industrial applications. With a strong emphasis on innovation and quality, Sumitomo (Sei) Steel Wire Corp. leverages advanced technologies to enhance its product offerings. Headquartered in Itamishi, Japan, the company serves a diverse range of markets both domestically and internationally.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

18 Patents

#1 in Itamishi

#3,121 in Japan

#34,187 in the World

Itamishi, Japan

Sumitomo (Sei) Steel Wire Corp.

Forward Citations = 26

43 inventors:

Kenichi Okamoto (6 out of 13 patents)

Nozomu Kawabe (5 out of 50 patents)

Hiromu Izumida (4 out of 14 patents)

4. Shinei Takamura (4 out of 9 patents)

5. Yuichi Sano (4 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sumitomo (Sei) Steel Wire Corp.. Retrieved from https://idiyas.com/company/sumitomo-sei-steel-wire

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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