| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 3 | |
| #2 | Canada | 2 | |
| #3 | Germany | 1 | |
| #4 | Spain | 1 | |
| #5 | France | 1 | |
| #6 | United Kingdom | 1 | |
| #7 | Japan | 1 | |
| #8 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Platform constructions | |
| #2 | Vehicle parts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Walker Grant W | 6 |
| #2 | Guranto Daburiyuu Uookaa | 1 |
| #3 | Walker G W | 1 |
| #4 | Ford Duane B | 1 |
| #5 | Meinzer Lester N | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3982734A | Impact barrier and restraint | |
| US4008915A | Impact barrier for vehicles | |
| US3944187A | Roadway impact attenuator | |
| CA955969A | Energy absorbing device |