Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6627140 | Method for manufacturing diaphragm for loudspeaker | Hitoshi Sato, Kiyoshi Ikeda, Hiroko Yamazaki | 2003-09-30 |
| 6543574 | Method of making a speaker edge containing isocyanate and polyol | Shinya Kaneko, Kiyosi Ikeda, Hiroko Yamasaki | 2003-04-08 |