| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 13 | |
| #2 | France | 4 | |
| #3 | United Kingdom | 3 | |
| #4 | Denmark | 2 | |
| #5 | Belgium | 1 | |
| #6 | Switzerland | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Furniture and games | |
| #3 | Mechanical elements | |
| #4 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Locks | |
| #2 | Mechanical control devices | |
| #3 | Kitchen equipment | |
| #4 | Household appliances | |
| #5 | Bolts for doors or windows | |
| #6 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Grosssteinbeck Willi | 3 |
| #2 | Heidkamp Karl Josef | 2 |
| #3 | Heidtkamp Josef Karl | 1 |
| #4 | Schlegel Werner Dipl-Ing | 1 |
| #5 | Heidkamp Josef | 1 |
| #6 | Neuhaus Artur | 1 |
| #7 | Otto Grosssteinbeck G M B H | 1 |
| #8 | Fussbahn Alois | 1 |
| #9 | Schlegel Dipl-Ing Werner | 1 |
| Publication | Filing date | Title |
|---|---|---|
| FR1401067A | Door knob or keyhole rosette | |
| FR1381134A | Door handle | |
| GB927300A | Door handle assembly | |
| FR1283573A | Door handle assembly | |
| GB869907A | An improved door-handle connection | |
| FR748072A | Ham boiler |