Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5085534 | Mechanical pencil lead protection pipe with protuberance | Nobuo Murasawa, Tsukasa Sasaki, Yuichi Miyahara, Hiroaki Okabayashi, Tetsuya Sugiyama +2 more | 1992-02-04 |