Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10584408 | Carburization device and carburization method | Wataru Nakao, Akira Tange, Morimichi Kai | 2020-03-10 |
| 9404547 | Steel for high-strength spring, method for producing same, and high-strength spring | Hideki Okada, Akira Tange, Isao Sumiyoshi | 2016-08-02 |