Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880886 | Process for production of highly water-absorbent resin | Susumu Kondo, Tetsuo Moriya | 1989-11-14 |
| 4872787 | Method of drilling printed circuit board | Kunio Arai, Hiromi Nishiyama, Yasuhiko Kanaya | 1989-10-10 |
| 4852074 | Method of measurement of crosstalk noise in playback information signal | Hozumi Tanaka, Nobuyoshi Kuroda, Takumi Ito | 1989-07-25 |