| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Chemical engineering | |
| #3 | Machines | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Guiding railway traffic | |
| #2 | Separation | |
| #3 | Unspecified technologies | |
| #4 | Gearing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Gerlach George W | 13 |
| #2 | Edwards Louis | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1297343A | Circuit-breaker. | |
| US1211697A | Safety block-signal. | |
| US1135575A | Block-signal control safety appliance for locomotives. | |
| US1135574A | Block-signal control safety appliance for locomotives. | |
| US1191414A | Safety block-signal. | |
| US999643A | Transmission mechanism. | |
| US871166A | Railway signal and safety appliance. | |
| US818679A | Filtering-plate. | |
| CA97115A | Filter plate | |
| CA94983A | Pressure filter | |
| US793369A | Railway switch, lock, and semaphore. | |
| US778746A | Filter-plate. | |
| US765277A | Pressure-filter. |