| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 6 | |
| #2 | EPO (European Patent Office) | 5 | |
| #3 | United States | 4 | |
| #4 | Australia | 3 | |
| #5 | Brazil | 3 | |
| #6 | South Africa | 3 | |
| #7 | Israel | 2 | |
| #8 | Republic of Korea | 1 | |
| #9 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Grinding or polishing devices | |
| #2 | Grinding tools | |
| #3 | Water treatment |
| # | Name | Total Patents |
|---|---|---|
| #1 | Friel Daniel D | 26 |
| #2 | Daniel D Friel | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4897965A | Knife sharpening apparatus | |
| ZA8501702B | Knife sharpener | |
| US4627194A | Method and apparatus for knife and blade sharpening |