Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6530389 | Existing pipe cut-off method, existing pipe slitting method, piping structure, and valve insertion method for inserting a valve in a line without stopping passage of water or fluid | Toshiyuki Sato, Tamotsu Yamashita, Gumpei Yokoyama | 2003-03-11 |
| 6470907 | Existing pipe cut-off method, existing pipe slitting method, piping structure, and valve insertion method for inserting a valve in a line without stopping passage of water or fluid | Toshiyuki Sato, Tamotsu Yamashita, Gumpei Yokoyama | 2002-10-29 |
| 5431453 | Pipe coupling arrangement | Tamotsu Yamashita | 1995-07-11 |