| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 2 | |
| #2 | South Africa | 2 | |
| #3 | Australia | 1 | |
| #4 | Brazil | 1 | |
| #5 | Canada | 1 | |
| #6 | Switzerland | 1 | |
| #7 | China | 1 | |
| #8 | Czechia | 1 | |
| #9 | Egypt | 1 | |
| #10 | EPO (European Patent Office) | 1 | |
| #11 | Finland | 1 | |
| #12 | Hungary | 1 | |
| #13 | Ireland | 1 | |
| #14 | Israel | 1 | |
| #15 | Lithuania | 1 | |
| #16 | Morocco | 1 | |
| #17 | Mexico | 1 | |
| #18 | Norway | 1 | |
| #19 | New Zealand | 1 | |
| #20 | Poland | 1 | |
| #21 | Portugal | 1 | |
| #22 | Turkey | 1 | |
| #23 | WIPO (World Intellectual Property Organization) | 1 | |
| #24 | Zambia | 1 | |
| #25 | Zimbabwe | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kaalstadt Oscar William | 11 |
| #2 | Oscar William Kaalstadt | 3 |
| #3 | Kaalstad Oscar William | 3 |
| #4 | Kaalstad Oscar W | 2 |
| #5 | Kaalstadt Oscar W | 2 |
| #6 | Bennett Ronald | 2 |
| #7 | O W Kaalstadt | 1 |
| #8 | Kaalstad Oscar | 1 |
| #9 | William Kaalstadt Oscar | 1 |
| Publication | Filing date | Title |
|---|---|---|
| WO2011121391A1 | Drill bit | |
| CH689948A5 | Boring bit for wells | |
| ZM4691A1 | Disc drill bit | |
| NZ240761A | Well drilling bit; cutting discs mounted with rearwardly offset axes relative to direction of rotation of drill shaft | |
| US5147000A | Disc drill bit | |
| US5064007A | Three disc drill bit |