Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8303206 | Ink composition for writing tool and writing tool | — | 2012-11-06 |
| 7600937 | Aqueous gel ballpoint pen and method for the production thereof | — | 2009-10-13 |
| 5866669 | Sulfonated phenol-formaldehyde resin for paper-making | Hisao Takatsu, Seika Tay, Mitsuyoshi Kato | 1999-02-02 |