Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4398995 | Papery product | Hideharu Sasaki, Tsutomu Nakamura, Keizo Shimada, Yuzo Aito | 1983-08-16 |
| 4324706 | Friction material | Hiromitsu Takamoto, Keizo Shimada, Yasusaburo Sugita | 1982-04-13 |