Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6619618 | Gate valve | Tsuneo Ishigaki, Seiichi Furutate | 2003-09-16 |
| 6464203 | Swing-door gate valve | Tsuneo Ishigaki, Ikuo Kanzaka | 2002-10-15 |
| 6433308 | High vacuum valve | Tsuneo Ishigaki, Keiichi Shibuya, Mamoru Fukuda | 2002-08-13 |
| 6390449 | Gate valve | Tsuneo Ishigaki, Ikuo Kanzaka | 2002-05-21 |
| 6299133 | Gate valve | Tsuneo Ishigaki | 2001-10-09 |
| 6095180 | High-vacuum valve | Tsuneo Ishigaki | 2000-08-01 |
| 4906496 | Double-walled tube assembly | Masayuki Hosono, Hirozo Uejo, Mitsuru Tokumoto | 1990-03-06 |