Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6034183 | Polymer having quaternary ammonium groups and process for the production thereof | Tatsuya Okumura, Junji Shiigi | 2000-03-07 |
| 5330582 | Method for cleaning rosin-base solder flux | Machio Chihara, Tatsuya Okumura, Takashi Tanaka | 1994-07-19 |
| 5256209 | Method for cleaning rosin-base solder flux | Machio Chihara, Tatsuya Okumura, Takashi Tanaka | 1993-10-26 |
| 5096504 | Cleaning agent for rosin-base solder flux | Machio Chihara, Tatsuya Okumura, Takashi Tanaka | 1992-03-17 |