| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 3 | |
| #2 | Australia | 2 | |
| #3 | Canada | 2 | |
| #4 | EPO (European Patent Office) | 2 | |
| #5 | Japan | 2 | |
| #6 | Mexico | 2 | |
| #7 | Brazil | 1 | |
| #8 | China | 1 | |
| #9 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Pipes | |
| #3 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Mefferd Floyd R | 9 |
| #2 | Mefferd Roy J | 4 |
| #3 | Mefferd Larry C | 3 |
| #4 | Mefferd Floy R | 1 |
| #5 | Roi Jiei Mefuaado | 1 |
| #6 | Furoido Aaru Mefuaado | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US5450913A | Continuous soil sampling system and method | |
| EP0586992A1 | Tube section having slots for sampling | |
| CA2104987A1 | Tube section having slots for sampling | |
| US5269572A | Apparatus and method for coupling elongated members |