| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Canada | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | South Africa | 2 | |
| #5 | Australia | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Basic materials chemistry |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Materials for miscellaneous applications |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hokanson Lyle W | 4 |
| #2 | Hokanson L | 3 |
| #3 | Klaas W | 2 |
| #4 | Hokanson Lyle William | 2 |
| #5 | Fowke R | 2 |
| #6 | Levangie Gilbert | 2 |
| #7 | Levangie G | 1 |
| #8 | Fowke Ronald T | 1 |
| #9 | Smith E | 1 |
| #10 | Smith E P | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1275032A | Drill pipe | |
| US3670827A | Underground drilling machine | |
| US3669196A | Universal drilling rig | |
| CA928286A | Underground drilling machine | |
| CA919160A | Universal drilling rig | |
| US3658368A | Drill rod structures | |
| US3667784A | Drill rod structure | |
| GB1246244A | Core drilling in non-supporting earth formations |