| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Civil engineering | |
| #4 | Measurement | |
| #5 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Hydraulic engineering | |
| #2 | Venting or aerating devices | |
| #3 | Unspecified technologies | |
| #4 | Pipes | |
| #5 | Measuring volume | |
| #6 | Load transportation vehicles | |
| #7 | Shaping clay |
| # | Name | Total Patents |
|---|---|---|
| #1 | Cronholm Frederick N | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US1474582A | Construction of dams and method of building same | |
| US1474581A | Construction of dams | |
| US1366062A | Measuring-turnout for irrigating systems | |
| US1220960A | Locking means for gates of irrigating-canals. | |
| CA167531A | Locking means for gates of irrigating canals | |
| US1121170A | Locking means for gates of irrigating-canals. | |
| US1095455A | Locking means for gates of irrigating-canals. | |
| US1103270A | Mold for concrete pipe. | |
| US1048045A | Pipe-joint. | |
| CA131948A | Spoon gauge | |
| US969845A | Spoon-gage. | |
| US969943A | Pipe-coupling. | |
| US970893A | Dumping-wagon. |