Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4708902 | Polyester films suitable for use in magnetic recording media | Shigeo Utsumi, Takashi Kagiyama, Satoshi Otonari, Koichiro Ikushima, Norio Okumura | 1987-11-24 |
| 4680217 | Polyester film for magnetic recording media | Shigeo Utsumi, Kichinojyo Tomitaka | 1987-07-14 |
| 4617164 | Process for stretching polyester films | Shigeo Utsumi | 1986-10-14 |
| 4610833 | Process for preparing biaxially stretched polyester films | Shigeo Utsumi, Kichinojyo Tomitaka | 1986-09-09 |