Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5524401 | Roof with solar battery | Osamu Ishikawa | 1996-06-11 |
| 5509973 | Roof panel and roof structure with solar batteries | Osamu Ishikawa, Michio Sasaki, Akio Miwa | 1996-04-23 |