| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 22 | |
| #2 | Canada | 7 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Engines, pumps and turbines | |
| #3 | Mechanical elements | |
| #4 | Control | |
| #5 | Machines | |
| #6 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Rail vehicle suspensions | |
| #2 | Vehicle transmission mounting | |
| #3 | Systems controlling non-electric variables | |
| #4 | Cooling of machines | |
| #5 | Gearing | |
| #6 | Unspecified technologies | |
| #7 | Steam generation | |
| #8 | Clutches and brakes | |
| #9 | Steam turbines | |
| #10 | Railway bodies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Otis Spencer | 29 |
| #2 | Hart Harry S | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1090495A | Turbine. | |
| CA103534A | Railway car truck | |
| CA103532A | Car truck | |
| CA103533A | Railway car truck | |
| US862843A | Bolster. | |
| US869455A | Motor-car. | |
| US869454A | Steam-transformer. | |
| US840158A | Steam-transformer. | |
| US946262A | Reversible clutch. | |
| US840157A | Worm-gearing. | |
| US822979A | Railway-car bolster. | |
| US840156A | Railway-car truck. | |
| US826871A | Railway-car truck. | |
| US826870A | Rialway-car truck. | |
| US836942A | Railway-car. | |
| US797601A | Boiler. | |
| CA83207A | Car truck | |
| CA83211A | Bolster and truck mechanism for railway cars | |
| CA81849A | Truck for vehicles | |
| CA81850A | Bolster and truck for vehicles |