Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5772831 | Filter membrane element and method of manufacturing same | Kiyoshi Izumi | 1998-06-30 |
| 5651888 | Filtration membrane cartridge | Kenji Shimizu, Hiroshi Ishida, Yutaka Yamada, Kiyoshi Izumi, Yuji Soeda | 1997-07-29 |
| 5482625 | Filtration membrane module | Kenji Shimizu, Hiroshi Ishida, Yutaka Yamada, Kiyoshi Izumi, Yuji Soeda | 1996-01-09 |
| 5192456 | Apparatus for treating activated sludge and method of cleaning it | Hiroshi Ishida, Yutaka Yamada, Kiyoshi Izumi | 1993-03-09 |