Issued Patents 1994
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5359584 | Data recording/reproducing method and apparatus having means for reliable detection of unrecorded sectors | Yoshihisa Fukushima, Yuzuru Kuroki, Tamotsu Matsuo | 1994-10-25 |
| 5313612 | Information recording and reproducing apparatus including both data and work optical disk drives for restoring data and commands after a malfunction | Yoshihisa Fukushima | 1994-05-17 |
| 5303225 | Multi-layered optical disk with track and layer identification | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1994-04-12 |
| 5293566 | Information recording and reproducing apparatus | Yoshihisa Fukushima, Yuji Takagi, Yasushi Azumatani, Hiroshi Hamasaka | 1994-03-08 |