Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4185972 | Electric charge holding structure for electretized air-filter medium | Takuji Watanabe, Takashi Takahira | 1980-01-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4185972 | Electric charge holding structure for electretized air-filter medium | Takuji Watanabe, Takashi Takahira | 1980-01-29 |