Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5375137 | Semiconductor laser device featuring group III and IV compounds doped with amphoteric impurity to vary electrical resistance according to direction of crystal plane | Yoshiyuki Hirayama, Hitoshi Shimizu | 1994-12-20 |