| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Australia | 3 | |
| #3 | Brazil | 3 | |
| #4 | Canada | 3 | |
| #5 | Germany | 3 | |
| #6 | United Kingdom | 3 | |
| #7 | Italy | 3 | |
| #8 | Japan | 3 | |
| #9 | France | 2 | |
| #10 | Argentina | 1 | |
| #11 | Denmark | 1 | |
| #12 | Egypt | 1 | |
| #13 | Greece | 1 | |
| #14 | Republic of Korea | 1 | |
| #15 | Mexico | 1 | |
| #16 | Netherlands | 1 | |
| #17 | New Zealand | 1 | |
| #18 | Philippines | 1 | |
| #19 | Sweden | 1 | |
| #20 | USSR (Union of Socialist Soviet Republics) | 1 | |
| #21 | Yugoslavia (Serbia and Montenegro) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Electrical machinery and energy |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Dynamo-electric machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Cherrington Martin D | 14 |
| #2 | Cherrington M | 8 |
| #3 | Cherrington M D | 3 |
| #4 | Maachin Deii Chaarinton | 2 |
| #5 | Maachin Dei Chierinton | 1 |
| #6 | Cherrington Martin Dee | 1 |
| Publication | Filing date | Title |
|---|---|---|
| KR800000953B1 | Method for placement of production casing under obstacle | |
| US4051911A | Apparatus and process for drilling underground arcuate paths utilizing directional drill and following liner | |
| US3996758A | Method for placement of production casing under obstacle | |
| US4043136A | System and method for installing production casings | |
| US3967689A | Reaming apparatus | |
| US4003440A | Apparatus and process for drilling underground arcuate paths utilizing directional drill and following liner |