Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6019189 | Noise barrier wall | Hiroshi Shima, Toshiyuki Watanabe, Koich Matsumoto, Kunio Nakasaki | 2000-02-01 |
| 5971096 | Noise barrier and method of installing same | Koich Matsumoto, Minoru Yamamoto, Toshiyuki Watanabe, Teruo Nakazawa, Hiroshi Shima | 1999-10-26 |