Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876557 | Recording medium of air-sandwich structure | — | 1989-10-24 |
| 4860273 | Method of recording information and information recording medium employed for the same | Mitsuru Sawano | 1989-08-22 |
| 4832992 | Process for the preparation of information recording medium | Yoshio Inagaki | 1989-05-23 |
| 4821050 | Optical information recording medium | Yonosuke Takahashi | 1989-04-11 |