Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5034370 | Color developer for pressure-sensitive recording paper | Yukio Tokunaga | 1991-07-23 |
| 4920186 | Color developer for pressure sensitive recording paper and production thereof using phenol-mesitylene-formaldehyde resin | Yukio Tokunaga | 1990-04-24 |
| 4920185 | Color developer for pressure-sensitive recording paper and production thereof using a phenol-xylene-formaldehyde resin | Yukio Tokunaga | 1990-04-24 |
| 4870154 | Method of producing a quick-curing novolac phenolic resin using ammonium halides | Toshiaki Nishimura, Kozuichi Ikeda | 1989-09-26 |
| 4698370 | Production of phenolic resin composite foam | Naomitsu Inoue, Yukio Tokunaga | 1987-10-06 |
| 4694028 | Manufacturing method for phenol resin foam | Naomitsu Inoue, Yukio Tokunaga | 1987-09-15 |
| 4529751 | Resin coated sand for casting | — | 1985-07-16 |
| 4468486 | Coated sand and method for producing | Noriaki Matsushima, Yukio Tokunaga | 1984-08-28 |
| 4460716 | Coated sand composition and method for producing same | Shigeru Nemoto, Yukio Tokunaga | 1984-07-17 |
| 4460717 | Resin coated sand composition and method of producing same | Shigeru Nemoto, Yukio Tokunaga | 1984-07-17 |
| 4459375 | Resin coated sand for shell foundry process | Yukio Tokunago | 1984-07-10 |
| 4459376 | Resin-coated sand for shell-molds and method for producing same | Noriaki Matsushima, Yukio Tokunaga | 1984-07-10 |
| 4459377 | Shell-molding resin coated sand | Tosaku Amakawa, Shigeru Nemoto | 1984-07-10 |
| 4452927 | Resin coated sand for shell molding process | Noriaki Matsushima, Yukio Tokunaga | 1984-06-05 |
| 4452926 | Resin-coated sand composition and method for producing same | Noriaki Matsushima, Hajime Kirabayashi | 1984-06-05 |
| 4426484 | Method for accelerating cure of resole type phenolic resins | Katsuyuki Tanaka | 1984-01-17 |
| 4419477 | Powder phenolic resin composition for dry process resin-bonded felt | Naomitsu Inoue | 1983-12-06 |
| 4418161 | Resin coated sand and method for producing same | Noriaki Matsushima, Yukio Tokunaga | 1983-11-29 |