Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4570946 | Nitrided piston ring with outer layer on surface | Takeshi Tsuchiya | 1986-02-18 |
| 4557492 | Nitrided piston ring with outer layer on surface | Takeshi Tsuchiya, Tsutomu Kimura | 1985-12-10 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4570946 | Nitrided piston ring with outer layer on surface | Takeshi Tsuchiya | 1986-02-18 |
| 4557492 | Nitrided piston ring with outer layer on surface | Takeshi Tsuchiya, Tsutomu Kimura | 1985-12-10 |