| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 6 | |
| #2 | Mexico | 4 | |
| #3 | Brazil | 3 | |
| #4 | EPO (European Patent Office) | 3 | |
| #5 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Civil engineering | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Machines for making railways | |
| #2 | Guiding railway traffic | |
| #3 | Explosive charges | |
| #4 | Blasting |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kuhn Stephen R | 13 |
| #2 | Young Keith | 12 |
| #3 | Stephen R Kuhn | 3 |
| #4 | Hoyer Ray | 1 |
| #5 | Remington James A | 1 |
| #6 | Ilia Petkov | 1 |
| #7 | Wright Dennis | 1 |
| #8 | Petkov Iiia | 1 |
| #9 | Donovan John L | 1 |
| #10 | Ivanyo Daniel A | 1 |
| Publication | Filing date | Title |
|---|---|---|
| BR0100929A | Rail road spring wing crossing with shock absorption | |
| CA2337732A1 | Lateral and vertical rail brace assembly | |
| CA2310662A1 | Electrically operated railroad switch machine | |
| US6286791B1 | Railroad spring wing frog with hold-open and shock dampening elements | |
| US6276642B1 | Railroad spring wing frog assembly |