Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4667543 | Method of manufacturing a rock bit cone | Tomoo Miyasaka, Yukio Nishiyama, Toshio Atsuta | 1987-05-26 |
ST
Shoichiro Tsugaki
Overall (All Time): #3,974,901 of 4,157,543Top 100%
1
Patents All Time