| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Denmark | 2 | |
| #2 | EPO (European Patent Office) | 2 | |
| #3 | Norway | 2 | |
| #4 | South Africa | 2 | |
| #5 | Argentina | 1 | |
| #6 | Australia | 1 | |
| #7 | Brazil | 1 | |
| #8 | Canada | 1 | |
| #9 | German Democratic Republic | 1 | |
| #10 | Spain | 1 | |
| #11 | Finland | 1 | |
| #12 | Ireland | 1 | |
| #13 | Israel | 1 | |
| #14 | New Zealand | 1 | |
| #15 | African Intellectual Property Organization | 1 | |
| #16 | Portugal | 1 | |
| #17 | Romania | 1 | |
| #18 | Turkey | 1 | |
| #19 | United States | 1 | |
| #20 | WIPO (World Intellectual Property Organization) | 1 | |
| #21 | Zambia | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Punching metal |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kaalstad Oscar William | 8 |
| #2 | Kaalstad Oscar W | 3 |
| #3 | Christen Sylvain | 2 |
| #4 | Kaalstad O W | 2 |
| #5 | Christen S E | 1 |
| #6 | Rooyen Eugene Van | 1 |
| #7 | Bronte Irma Van Orel | 1 |
| #8 | Kaalstad Oskar William | 1 |
| #9 | Reid Neil G | 1 |
| #10 | Clark Brian John | 1 |
| Publication | Filing date | Title |
|---|---|---|
| ZA9208688B | Removal of oil from water. | |
| FI831054L | Borrningsanordning | |
| RO93453A | Drilling bit | |
| DD202920A5 | drilling | |
| ZA8205592B | Drilling device | |
| AU8820382A | Drilling device | |
| IE820542L | Straightening shaped metal sheets after use | |
| EP0059995A2 | Apparatus for restoring used structural plates |