Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4668572 | Pencil lead composition with magnesium oxysulfate fibrous material | Fumio Iizuka, Yoshiaki Abe | 1987-05-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4668572 | Pencil lead composition with magnesium oxysulfate fibrous material | Fumio Iizuka, Yoshiaki Abe | 1987-05-26 |