Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4990218 | Method of testing conductor film quality | Katsuya Okumura | 1991-02-05 |
| 4891560 | Magnetron plasma apparatus with concentric magnetic means | Katsuya Okumura | 1990-01-02 |