| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 39 | |
| #2 | Canada | 6 |
| # | Technology | |
|---|---|---|
| #1 | Railway bodies | |
| #2 | Rail vehicle suspensions | |
| #3 | Registering devices | |
| #4 | Couplings | |
| #5 | Unspecified technologies | |
| #6 | Railway brakes | |
| #7 | Explosive charges | |
| #8 | Load transportation vehicles |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hart Harry S | 45 |
| #2 | Neikirk John Oscar | 1 |
| #3 | Morey William E | 1 |
| #4 | David Hindahl | 1 |
| #5 | Neikirk John O | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2040307A | Car wall construction | |
| US1890989A | Brake beam safety support | |
| US1876003A | Hopper car | |
| US1804769A | Car construction | |
| US1705248A | Blasting cartridge | |
| US1623592A | Car construction | |
| US1623591A | Car construction | |
| US1604350A | Maximum-capacity car | |
| US1533408A | Selective dump car | |
| US1555203A | Dump-car construction | |
| US1609297A | Dump-car construction | |
| US1496413A | Draft mechanism | |
| US1491766A | Safety unlocking device | |
| US1460902A | Watchman's recording mechanism | |
| US1472908A | Dump-car-door locking and releasing attachment | |
| US1449994A | Link latch for dump-car doors | |
| US1553612A | Dumping-door-latching link and controlling means therefor | |
| US1453835A | Hopper-car arrangement | |
| US1551991A | Door-operating mechanism | |
| US1461732A | Dump car |