Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11993097 | Mechanical pencil | Yusuke SANADA, Nobukazu Seri, Yuji Kawarazaki, Tomoharu Oonishi | 2024-05-28 |
| 11975560 | Ballpoint pen tip, ballpoint pen refill, and ballpoint pen | Naoto MASUSHIGE | 2024-05-07 |
| 10556459 | Writing instrument for forming thermochromic handwriting | Naoto MASUSHIGE | 2020-02-11 |
| 10500891 | Mechanical pencil | Nobukazu Seri, Atushi Ishikawa, Yuji Kawarazaki | 2019-12-10 |
| 9346313 | Ballpoint pen tip and ballpoint pen using the same | Kouichi Takayama | 2016-05-24 |
| 8430591 | Ballpoint pen tip and ballpoint pen | Keishi Okamoto, Satoru Ando, Tatsuyuki Nakatani, Yuki Nitta, Kunihiro Toyota +2 more | 2013-04-30 |