Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867629 | Dusttight storage cabinet apparatus for use in clean rooms | Yoshiyuki Iwasawa, Tsutomu Ishida, Hiroshi Harada, Kenji Okamoto, Shintaro Kobayashi +4 more | 1989-09-19 |
| 4843296 | AC motor drive apparatus | — | 1989-06-27 |
| 4833657 | Semiconductor frame buffer memory | — | 1989-05-23 |
| 4819259 | Rotary anode type x-ray apparatus | — | 1989-04-04 |
| 4797908 | Voltage-resonance type power supply circuit for X-ray tube | Fumio Ishiyama | 1989-01-10 |