| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 5 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Rail vehicle suspensions | |
| #2 | Couplings | |
| #3 | Clutches and brakes | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Tucker Herbert E | 9 |
| #2 | Sproul Donald F | 5 |
| #3 | Durbin Richard L | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2422638A | Stabilizing mechanism for railway trucks and the like | |
| US2428504A | Friction spring unit | |
| US2305914A | Railway truck | |
| US2277263A | Stabilizing mechanism for railway trucks and the like | |
| US2352030A | Bolster spring unit | |
| US2263599A | Friction bolster spring | |
| US2342499A | Friction spring unit for railway trucks | |
| US2236550A | Friction spring unit | |
| US2238083A | Draft gear | |
| US716993A | Brake-shoe. | |
| CA452091A | Friction spring unit | |
| CA413263A | Railway truck stabilizing mechanism | |
| CA416963A | Railway car truck | |
| CA439596A | Friction spring unit | |
| CA415377A | Friction bolster spring |