| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | German Democratic Republic | 2 | |
| #3 | Brazil | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | Italy | 1 | |
| #7 | Mexico | 1 | |
| #8 | Norway | 1 | |
| #9 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Briscoe Edward L | 6 |
| #2 | Teng Chuan Chin | 2 |
| #3 | Lawrence James D | 2 |
| #4 | Ransom Russell A | 1 |
| #5 | Teng Chuan Ch | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DD207237A5 | Hole tool | |
| US4394883A | Well jar | |
| US4270620A | Constant bottom contact tool | |
| US2965175A | Pipe puller |