| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Australia | 2 | |
| #3 | Canada | 2 | |
| #4 | EPO (European Patent Office) | 2 | |
| #5 | WIPO (World Intellectual Property Organization) | 2 | |
| #6 | South Africa | 2 | |
| #7 | Japan | 1 | |
| #8 | USSR (Union of Socialist Soviet Republics) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Shafts |
| # | Name | Total Patents |
|---|---|---|
| #1 | Snyder Larry Lynn | 10 |
| #2 | Snyder Larry L | 7 |
| Publication | Filing date | Title |
|---|---|---|
| US4637657A | Tunnel boring machine | |
| US4494799A | Tunnel boring machine | |
| US4486050A | Rectangular tunnel boring machine and method | |
| US4494617A | Shaft boring machine | |
| US4527837A | Tunnel boring machine |