Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872154 | Method for recording indicia for indicating presence or absence of error in medium after error checking and apparatus therefor | Katsumi Iijima | 1989-10-03 |
| 4870634 | Apparatus for recording and/or reproducing information data and a signal for synchronizing the same | — | 1989-09-26 |
| 4868806 | An information recording apparatus for recording a directory information unit on a single recording track of a recording medium based on the number of directory information units previously recorded in the single recording track | — | 1989-09-19 |