Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D302828 | Ink ribbon cassette for electronic typewriter | Aiko Endo | 1989-08-15 |
| 4835117 | Manufacturing method for semiconductor laser with mesa stripe | Masayuki Ishikawa, Motoyuki Yamamoto, Yukio Watanabe, Hideto Sugawara | 1989-05-30 |
| 4809287 | Double-heterostructure semiconductor with mesa stripe waveguide | Miyoko Watanabe, Hideto Sugawara, Masayuki Ishikawa, Yukio Watanabe, Motoyuki Yamamoto | 1989-02-28 |