Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4645293 | Optical waveguide coupler having a grating electrode | Taizo Yoshida, Akihito Tanji, Jiro Koyama | 1987-02-24 |
| 4312562 | Optical control device | Hideo Segawa, Jiro Koyama, Hiroshi Nishihara | 1982-01-26 |