Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11274446 | Screw-type rebar joint structure of deformed rebar and manufacturing method thereof | Keiji Hirai, Akira Fukuda | 2022-03-15 |
| D743581 | Reinforcing bar | Keiji Hirai, Akira Fukuda | 2015-11-17 |