| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 3 | |
| #2 | Switzerland | 2 | |
| #3 | France | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | Austria | 1 | |
| #6 | Belgium | 1 | |
| #7 | Denmark | 1 | |
| #8 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Wing fittings | |
| #2 | Springs | |
| #3 | Servomotors | |
| #4 | Pistons and sealings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Deursluiter Mij N V Dictator | 2 |
| #2 | Mueller Hans | 1 |
| #3 | Gibbons Paul E | 1 |
| #4 | Ischebeck Adolf | 1 |
| #5 | Trapman J | 1 |
| #6 | Dillen Albert V | 1 |
| #7 | Trapman Jan | 1 |
| #8 | Heilander Max | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1584169A1 | Door closer with hydraulic shock absorber | |
| GB764172A | Hydraulic cylinder with a piston rod passing through a stuffing box or the like | |
| DE845174C | Door closer | |
| DE838868C | Door closer with hydraulic shock absorber |