Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855637 | Oxidation resistant impregnated cathode | Shigehiko Yamamoto, Sadanori Taguchi, Susumu Sasaki | 1989-08-08 |
| 4796239 | Circuit unit for timepiece and process for fabricating the same | Tsuyoshi Hayakawa, Satoru Yamauchi, Isao Kondo | 1989-01-03 |