Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4220381 | Drill pipe telemetering system with electrodes exposed to mud | — | 1980-09-02 |
GG
Gerardus C. van der Graaf
Overall (All Time): #4,118,873 of 4,157,543Top 100%
1
Patents All Time