Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845574 | Apparatus for recording and reproducing digital signals on magnetic tape | Hiroshi Ii, Katsubumi Koyanagi | 1989-07-04 |
| 4739431 | Thin-film magnetic head | Katubumi Koyanagi, Hideyoshi Yamaoka | 1988-04-19 |
| 4700241 | Apparatus for recording and reproducing digital signals | Hiroshi Ii, Taizo Sasada | 1987-10-13 |