Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5118541 | Erasable optical disk media and method of recording/erasing the same | Osamu Yamamoto, Katsuji Hattori | 1992-06-02 |
| 4291781 | Speaker diaphragm and method of preparation of the same | Mitsuru Ieki | 1981-09-29 |