Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876007 | Plate-type filter cartridge with internal support | Sumio Ohtani, Masahiro Etoh, Masao Tsuruta, Ikuro Moriya, Masanori Ishiguro +1 more | 1989-10-24 |
| 4871456 | Stacked filter cartridge with porous filter support | Sumio Ohtani, Masahiro Etoh, Ikuro Moriya | 1989-10-03 |
| 4840733 | Fine porous membrane and process for producing the same | Jun Sasaki, Atsushi Adachi, Yukio Shinagawa, Sumio Ohtani | 1989-06-20 |
| 4837127 | Recording medium | Shinichiro Ohara | 1989-06-06 |