| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 3 | |
| #2 | Japan | 3 | |
| #3 | Brazil | 2 | |
| #4 | Argentina | 1 | |
| #5 | Canada | 1 | |
| #6 | EPO (European Patent Office) | 1 | |
| #7 | Greece | 1 | |
| #8 | Hong Kong | 1 | |
| #9 | Singapore | 1 | |
| #10 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Shafts | |
| #2 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Richardson Michael A | 2 |
| #2 | Maikuru Areguzaandaa Richiyaad | 2 |
| #3 | Richardson Michael Alexander | 2 |
| #4 | Richardson M | 2 |
| #5 | Mikaeru Arekisandaa Richiyaado | 1 |
| #6 | Alexander Richardson Michael | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JPS563796A | Method of lining tunnel and tunnel lining piece assembly | |
| CA1151436A | Installation of tunnel linings | |
| GB1554222A | Tunnelling systems | |
| GB1545879A | Propulsion system of tunnel boring shields | |
| GB1554221A | Mechanical full face rotary tunnel boring shields |