Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881008 | Photomultiplier with plural photocathodes | Hiroyuki Kyushima, Takahito Kato | 1989-11-14 |
| 4825066 | Photomultiplier with secondary electron shielding means | Masuo Ito | 1989-04-25 |