Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818148 | Frost damage proofed pile | Takashi Takeda, Toshiyuki Ohkuma, Kenji Kidera, Shigeru Nakagawa, Tetsuzo Hirose | 1989-04-04 |
| 4585681 | Frost damage proofed pile | Kenji Kidera, Shigeru Nakagawa, Takashi Takeda, Toshiyuki Okuma | 1986-04-29 |