Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886705 | Polyphenylene sulfide film | — | 1989-12-12 |
| 4840830 | Polyester film for magnetic recording tape | Kiyoshi Yasumura | 1989-06-20 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886705 | Polyphenylene sulfide film | — | 1989-12-12 |
| 4840830 | Polyester film for magnetic recording tape | Kiyoshi Yasumura | 1989-06-20 |