Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4345322 | Pickup cartridge for reproducing signals recorded on a 45-45 stereophonic record disk | Hisashi Okada | 1982-08-17 |
| 4281225 | Pickup cartridge for reproducing signals recorded on a 45-45 stereophonic record disk | Tsugio Ito, Hisashi Okada | 1981-07-28 |
| 4238646 | Pickup cartridge for reproducing signals recorded on a 45--45 stereophonic record disk | Hisashi Okada | 1980-12-09 |