| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Canada | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | Germany | 2 | |
| #5 | Australia | 1 | |
| #6 | Japan | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Mining |
| # | Name | Total Patents |
|---|---|---|
| #1 | Langfield Edward R | 9 |
| #2 | Hile James L | 6 |
| #3 | Hird David L | 5 |
| #4 | Hile J L | 1 |
| #5 | Hird D | 1 |
| #6 | Deibitsudo Eru Haado | 1 |
| #7 | Jieimuzu Eru Hairu | 1 |
| #8 | Edowaado Aaru Rangufuiirudo | 1 |
| #9 | Langfield E R | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4252375A | Wear or thrust plates for hydraulic rock splitting apparatus | |
| US4215901A | Hydraulically actuated tool for mechanically splitting rock-like material | |
| US4168862A | Wear or thrust plates for hydraulic rock splitting apparatus | |
| US4114951A | Hydraulically actuated tool for mechanically splitting rock-like material |