Issued Patents 2002
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6490683 | Optical disk having electronic watermark, reproducing apparatus thereof and copy protecting method using the same | Hideo Ando, Tadashi Kojima, Kouichi Hirayama | 2002-12-03 |
| 6465069 | Information recording medium and method of manufacturing resinous substrate for use in the recording medium | Tadashi Kobayashi | 2002-10-15 |
| 6451401 | Information recording medium and method of manufacturing resinous substrate for use in the recording medium | Tadashi Kobayashi | 2002-09-17 |
| 6438692 | Copy protection apparatus and information recording medium used in this copy protection apparatus | Taku Kato, Takehisa Kato, Kenjiro Endoh, Naoki Endoh | 2002-08-20 |