Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4253545 | Escape device for use in multistoried buildings | Katsuyuki Sadakane, Hidemasa Okazaki | 1981-03-03 |
| 4209077 | Escape device for use in multistoried buildings | Katsuyuki Sadakane, Hidemasa Okazaki | 1980-06-24 |