| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 31 | |
| #2 | United Kingdom | 4 | |
| #3 | United States | 2 | |
| #4 | Switzerland | 1 | |
| #5 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Transport | |
| #3 | Surface technology and coating | |
| #4 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Springs | |
| #2 | Cycle brakes | |
| #3 | Vehicle suspension arrangements | |
| #4 | Wheelchairs and sledges | |
| #5 | Transferring liquids | |
| #6 | Clutches and brakes | |
| #7 | Metallic material removal | |
| #8 | Electrolytic coating production | |
| #9 | Nails | |
| #10 | Manipulators |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ludwig Hans | 7 |
| #2 | Hans Ludwig | 3 |
| Publication | Filing date | Title |
|---|---|---|
| GB404689A | Improvements in or relating to the treatment of steel tools | |
| GB322475A | Improvements in and relating to shock absorbers, more particularly for automobile vehicles | |
| GB282881A | Improvements in shock absorbers | |
| US1784191A | Shock absorber | |
| US1457311A | Free wheel hub | |
| GB161096A | Improvements in and relating to back-pedalling brake and free wheel hubs for cycles | |
| DE473635C | Adjustment device for shock absorbers of motor vehicles |