| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Brazil | 1 | |
| #3 | Canada | 1 | |
| #4 | Denmark | 1 | |
| #5 | EPO (European Patent Office) | 1 | |
| #6 | Spain | 1 | |
| #7 | Norway | 1 | |
| #8 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Geophysics |
| # | Name | Total Patents |
|---|---|---|
| #1 | Macleod Norman C | 9 |
| #2 | Wachtler William J | 1 |
| #3 | Yang Thomas M | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4739325A | Apparatus and method for down-hole EM telemetry while drilling | |
| US4608861A | MWD tool for measuring weight and torque on bit | |
| US4630243A | Apparatus and method for logging wells while drilling | |
| US4578675A | Apparatus and method for logging wells while drilling |