| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | Austria | 1 | |
| #3 | Belgium | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | France | 1 | |
| #6 | United States | 1 | |
| #7 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Stewen Wilhelm | 3 |
| #2 | Stefaniak Klaus | 3 |
| #3 | Hoelken Norbert | 2 |
| #4 | Krosse Wilhelm | 2 |
| #5 | Holken Norbert | 1 |
| #6 | Liermann Guenter Dipl Ing | 1 |
| #7 | Lamerz Heinz | 1 |
| #8 | Schneider Helmut | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US5238252A | Shut-off fittings with a sealing device | |
| DE4100862A1 | Shut-off valve with bellows sealing - has two internal bellows, one softer than other, activated by shoulder on positioning rod | |
| DE3520533A1 | Shut-off member, designed as a single-plate slide, for a pipe conduit |