| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | Austria | 3 | |
| #3 | Belgium | 2 | |
| #4 | Canada | 2 | |
| #5 | Switzerland | 2 | |
| #6 | Finland | 2 | |
| #7 | France | 2 | |
| #8 | Ireland | 2 | |
| #9 | Norway | 2 | |
| #10 | Denmark | 1 | |
| #11 | United Kingdom | 1 | |
| #12 | Netherlands | 1 | |
| #13 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Consumer goods | |
| #3 | Civil engineering | |
| #4 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Pipes | |
| #2 | Filing and indexing | |
| #3 | Animal care | |
| #4 | Water-closets with flushing devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Vanderhoven Jean | 15 |
| #2 | Jean Vanderhoven | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE2427570A1 | SELF-BLOCKING CONNECTOR FOR A PIPE OR THE SAME | |
| DE1911064A1 | Self-locking pipe connection | |
| GB373887A | Improvements in or relating to record cards for card indexes | |
| CA897211A | Self-locking connector for pipes and the like |