Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5006689 | Vacuum insulated storage-type electric water heater having an external bubble pump heating unit | Kazumi Mori, Hisao Koizumi | 1991-04-09 |
| 4959526 | Storage type electric water heater having a closed circulation loop with a bubble pump | Kazumi Mori, Hisao Koizumi | 1990-09-25 |