Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4875170 | Method and apparatus for estimating life expectancy of mechanical structures | Sadao Umezawa, Saburo Usami, Hiroshi Miyata, Hajime Toriya, Kuniyoshi Tsubouchi +1 more | 1989-10-17 |
| 4862777 | Method and apparatus for forming surfaces on piston rings | Masayuki Onimaru | 1989-09-05 |