Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10124287 | Gas concentration method | Hiroshi Tanaka, Yukio Fujiwara | 2018-11-13 |
| 8974575 | Method of enriching combustible gas | Takahisa Utaki | 2015-03-10 |
| 8940081 | Combustible gas enrichment apparatus | Takahisa Utaki, Hajime Morioka | 2015-01-27 |