| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 5 | |
| #2 | Australia | 4 | |
| #3 | Brazil | 4 | |
| #4 | Germany | 4 | |
| #5 | United Kingdom | 4 | |
| #6 | Sweden | 4 | |
| #7 | South Africa | 4 | |
| #8 | Zambia | 4 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wolda Tiete O | 9 |
| #2 | Wolda T | 6 |
| #3 | Wolda T O | 3 |
| #4 | Wolda Tiete Okke | 3 |
| #5 | Wolda Tiete | 1 |
| #6 | Tiete Okke Wolda | 1 |
| #7 | Wolda Orillia T O | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA983008A | Retrieving and lowering system for a core barrel | |
| GB1369340A | Core sampling | |
| CA984825A | Apparatus for lowering and retrieving a core barrel | |
| AU4239272A | Retrieving and lowering system for a core barrel | |
| CA968781A | Wireline core barrel with resilient latch fingers |