Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4922861 | Multiple-purpose instantaneous gas water heater | Osamu Tsutsui, Hideki Kawaguchi, Keiji Hayashi, Shingo Tanaka, Hiroshi Kobayashi +2 more | 1990-05-08 |
| 4819587 | Multiple-purpose instantaneous gas water heater | Osamu Tsutsui, Hideki Kawaguchi, Keiji Hayashi, Shingo Tanaka, Hiroshi Kobayashi +2 more | 1989-04-11 |