Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874516 | A ceramic filter for semi-ultrafiltration | — | 1989-10-17 |
| 4806861 | Method and system for detecting tape defects by transporting a tape in two directions | Yuji Urayama, Takeshi Nakatsukasa | 1989-02-21 |