Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4292417 | Semipermeable membrane | Kiyoshi Ishii, Zenjiro Honda, Hitoshi Tsugaya | 1981-09-29 |
| 4200726 | Semipermeable membrane of phenoxy resin containing sulfuric acid groups or salts thereof | Kiyoshi Ishii, Zenjiro Honda, Hitoshi Tsugaya | 1980-04-29 |