Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5002812 | Optical information recording medium, information recording method and optical information recording system using the medium | Masaakira Umehara, Tsutomu Satoh, Keiko Ichinose | 1991-03-26 |