| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 5 | |
| #2 | Germany | 5 | |
| #3 | United Kingdom | 5 | |
| #4 | France | 4 | |
| #5 | Austria | 3 | |
| #6 | Denmark | 2 | |
| #7 | Netherlands | 2 | |
| #8 | United States | 2 | |
| #9 | Belgium | 1 | |
| #10 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Nails | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Schenkel Willi | 3 |
| #2 | Schenkel W | 2 |
| #3 | Willi Schenkel | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB1352075A | Screw-receivering plugs | |
| GB1218095A | Improvements in or relating to expanding wall plugs | |
| FR1465893A | Synthetic pad | |
| US3383976A | Screw anchor with inclined fins | |
| GB1035131A | Improvements in or relating to expansion wall-plugs | |
| FR1365092A | Improvements to expandable tampons | |
| FR1264205A | Expanding ankle | |
| GB938011A | Improvements in or relating to expansible dowels |