Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5134365 | Probe card in which contact pressure and relative position of each probe end are correctly maintained | Kazumasa Okubo, Masao Okubo, Yasuro Yoshimitsu | 1992-07-28 |
| 5055778 | Probe card in which contact pressure and relative position of each probe end are correctly maintained | Kazumasa Okubo, Masao Okubo, Yasuro Yoshimitsu | 1991-10-08 |
| 4774413 | Ion emmissive head and ion beam irradiation device incorporating the same | Masao Okubo, Toshinori Takagi, Junzo Ishikawa | 1988-09-27 |
| 4638217 | Fused metal ion source with sintered metal head | Masao Okubo, Toshinori Takagi, Junzo Ishikawa | 1987-01-20 |