| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Environmental technology | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Hydraulic engineering | |
| #2 | Water treatment | |
| #3 | Reduction of greenhouse gas emissions | |
| #4 | Pipes | |
| #5 | Foundations and excavations |
| # | Name | Total Patents |
|---|---|---|
| #1 | Church William L | 13 |
| #2 | Hill George Everett | 1 |
| #3 | Ambursen Nils F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US870866A | Method of building dams. | |
| US870930A | Dam. | |
| US833506A | Dam. | |
| US799830A | Waterworks-dam. | |
| US799828A | Flash-board holder for dams. | |
| US799829A | Dam. | |
| US781871A | Dam and method of closing or completing same. | |
| US770844A | Retaining-wall. | |
| US799827A | Concrete flume. | |
| US764916A | Concrete dam. | |
| US788885A | Dam. | |
| US664532A | Sewage-disposal apparatus. | |
| US762466A | System of sewage disposal. |