Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876007 | Plate-type filter cartridge with internal support | Kyoichi Naruo, Sumio Ohtani, Masahiro Etoh, Masao Tsuruta, Masanori Ishiguro +1 more | 1989-10-24 |
| 4871456 | Stacked filter cartridge with porous filter support | Kyoichi Naruo, Sumio Ohtani, Masahiro Etoh | 1989-10-03 |