| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 3 | |
| #2 | Switzerland | 3 | |
| #3 | United States | 2 | |
| #4 | Germany | 1 | |
| #5 | Denmark | 1 | |
| #6 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Packaging and shipping | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Pipes | |
| #2 | Venting or aerating devices | |
| #3 | Cranes | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Berghoefer Hans | 8 |
| #2 | Hans Berghoefer | 3 |
| #3 | Griebel Herbert | 1 |
| #4 | Herbert Griebel | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1030999A | Flexible pipe coupling | |
| CA986158A | Pipe expansion joint | |
| CA966876A | Disengageable safety coupling for conduits | |
| US3477689A | Pipe coupling containing a valve | |
| GB895118A | A gas socket and coupler for a flexible gas pipe extension |