| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 9 | |
| #2 | Canada | 3 | |
| #3 | WIPO (World Intellectual Property Organization) | 2 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Chemical engineering | |
| #3 | Machines | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Cleaning | |
| #3 | Dredging | |
| #4 | Sewers | |
| #5 | Platform constructions | |
| #6 | Hydraulic engineering | |
| #7 | Pipes | |
| #8 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Harr Robert E | 12 |
| #2 | Crane Robert E | 1 |
| #3 | Crane Robert F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2008193220A1 | Method and apparatus for installing an underground pipe | |
| US2006243303A1 | Drainage structure cleaning tool and method | |
| US2007212169A1 | Method and apparatus for installing an underground pipe | |
| US2005214070A1 | Hydraulic wick apparatus and method | |
| US2005097689A1 | Culvert cleaning tool and method |