Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5273560 | Filter element and method for producing the same | Hiromi Ohta, Tadayuki Onoda | 1993-12-28 |
| 5043000 | Air cleaner element and method of manufacturing the same | — | 1991-08-27 |
| 4976858 | Multi-layer filter medium | — | 1990-12-11 |
| 4793923 | Gradient density filter medium | Tatsuo Ohta, Takashi Nagashima, Daisuke Horiuchi, Masayuki Okazaki, Naoki Ebisui | 1988-12-27 |