Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4829387 | Rotary head type digital signal reproducing device for controlling tape speed according to a tracking error | — | 1989-05-09 |
| 4806787 | Schmitt circuit for semiconductor integrated circuit | Katsuji Hirochi, Takanori Sugihara | 1989-02-21 |