Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865898 | Polyester film for magnetic recording media | Shigeo Utsumi, Kichinojyo Tomitaka, Toshifumi Takisawa | 1989-09-12 |
| 4814426 | Shrinkable polyester film for packaging | Shigeo Utsumi | 1989-03-21 |