Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5436054 | Electret Filter | Syoji Tokuda | 1995-07-25 |
| 5240610 | Flexible tubular filtering material | Toshiaki Hayashi | 1993-08-31 |
| 5112677 | Electret sheet and a method for the production of the same | Satoshi Takase | 1992-05-12 |
| 5110620 | Method for the production of an electret sheet | Satoshi Takase | 1992-05-05 |
| 4983193 | Filter and process for the production thereof | Susumu Ohmori, Hideki Komagata | 1991-01-08 |
| 4731135 | Process for making a filter having a continuous density gradient | Susumu Ohmori, Hideki Komagata | 1988-03-15 |