| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Germany | 3 | |
| #3 | Switzerland | 2 | |
| #4 | France | 2 | |
| #5 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Mechanical elements | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Rail vehicle suspensions | |
| #2 | Lubricating | |
| #3 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wilhelm Holtorp | 6 |
| #2 | Holtorp Wilhelm | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US1472363A | Lubricating device for axle journals | |
| US1397050A | Circulating lubrication | |
| US1451222A | Bearing | |
| GB153846A | Improvements relating to the lubrication of bearings | |
| US1376094A | Means for lubricating bearings |