Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11052443 | Method of producing inner spiral grooved tube and apparatus for producing inner spiral grooved tube | Yuki Hateruma | 2021-07-06 |
| 10933456 | Production method and production device for tube with spirally grooved inner surface | Takeshi Sakagami, Yuki Hateruma | 2021-03-02 |