| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Canada | 4 | |
| #3 | EPO (European Patent Office) | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | Australia | 1 | |
| #6 | Mexico | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Measurement | |
| #3 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Machines for making railways | |
| #2 | Measuring length, angles and areas | |
| #3 | Railway equipment | |
| #4 | Analysing materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | Bradshaw Bruce W | 5 |
| #2 | Jaeggi Hans P | 5 |
| #3 | Leach David J | 2 |
| #4 | Clive Robert N | 1 |
| #5 | Sroka Dennis Andrew | 1 |
| #6 | Perry William Earl | 1 |
| #7 | Bradshaw Bruce William | 1 |
| #8 | Sroka Dennis A | 1 |
| #9 | Janggi Hans P | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4625412A | Apparatus and method for measuring the wear of railroad rail | |
| US4583327A | Rail grinding car | |
| GB8325135D0 | Workhead with elastomeric pivots | |
| CA1199114A | Track curve lining method and apparatus | |
| US4577494A | Apparatus and method for measuring the wear of railroad rail | |
| US4468966A | Railroad track inspection car | |
| US4452146A | Railroad track tamper level control system |