Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4803564 | Electronic blackboard system | — | 1989-02-07 |
| 4797106 | Electronic blackboard system | Seiji Umehara | 1989-01-10 |
KS
Katsuyoshi Sakai
Overall (All Time): #2,327,775 of 4,157,543Top 60%
2
Patents All Time