Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6158474 | Rust-resistant sleeve for use in a branch hole of a water pipeline | Kazuo Ishikawa | 2000-12-12 |
| 5971441 | Rust-resistant sleeve for use in a branch hole of a water pipeline | Kazuo Ishikawa | 1999-10-26 |