| # | Country | Total Patents | |
|---|---|---|---|
| #1 | South Africa | 4 | |
| #2 | Australia | 3 | |
| #3 | United States | 3 | |
| #4 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Shafts | |
| #2 | Nails | |
| #3 | Analysing materials | |
| #4 | Earth drilling | |
| #5 | Geophysics |
| # | Name | Total Patents |
|---|---|---|
| #1 | Mraz Dennis | 8 |
| #2 | Dennis Mraz | 4 |
| #3 | Mahyera Anil | 2 |
| #4 | Mraz Dennis Z | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4976571A | Anchor device for securing rock bolts | |
| US5018389A | Rock-stress measuring method | |
| AU1655588A | Improved expansion anchor | |
| US4820095A | Anchor device for securing rock bolts |