Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5607490 | Filter having chemical resistance, antistatic property and water vapor resistance, and process for producing the same | Takeshi Hazeyama, Hitoshi Otaka | 1997-03-04 |
| 5558689 | Reinforced filter element | Hiroyuki Yanagihara, Takeshi Hazeyama, Hitoshi Otaka, Teiji Hashimoto, Sansan Souma | 1996-09-24 |