Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5694387 | Optical medium having a data pattern for detecting an upside-down insertion, and reproducing apparatus for use therewith | Yoshihisa Fukushima, Michiyoshi Nagashima | 1997-12-02 |
| 5616390 | Optical recording medium permitting detection of identification signals in land areas and groove areas, optical information recording/reproducing apparatus and apparatus for producing an original disk for forming a disk substrate | Naoyasu Miyagawa | 1997-04-01 |