Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839773 | Dielectric filter | Youhei Ishikawa, Kikuo Tsunoda, Hirotsugu Abe | 1989-06-13 |
| 4821006 | Dielectric resonator apparatus | Youhei Ishikawa, Kikuo Tsunoda, Hirotsugu Abe | 1989-04-11 |