Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8337107 | Mechanical pencil | Norio Ohsawa, Takeo Fukumoto, Takeshi Kobayashi, Hirotake Izawa, Kyo Nakayama | 2012-12-25 |
| 8328446 | Mechanical pencil | Hirotake Izawa, Takeo Fukumoto, Norio Ohsawa, Kyo Nakayama | 2012-12-11 |
| 7815385 | Mechanical pencil | Hirotake Izawa, Takeo Fukumoto, Norio Ohsawa, Kyo Nakayama | 2010-10-19 |
| 7654763 | Mechanical pencil | Hirotake Izawa, Takeo Fukumoto, Norio Ohsawa, Kyo Nakayama | 2010-02-02 |