Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4444399 | Mechanical seal and method of forming a sliding surface thereof | Tadamasa Yanai, Yoshio Kameyama, Takao Shimomura | 1984-04-24 |
| 4420162 | Mechanical seal and method of forming a sliding surface thereof | Tadamasa Yanai, Yoshio Kameyama, Takao Shimomura | 1983-12-13 |