| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 35 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Machines | |
| #3 | Environmental technology | |
| #4 | Control | |
| #5 | Chemical engineering | |
| #6 | Mechanical elements | |
| #7 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Measuring volume | |
| #2 | Unspecified technologies | |
| #3 | Water treatment | |
| #4 | Systems controlling non-electric variables | |
| #5 | Venting or aerating devices | |
| #6 | Mixing | |
| #7 | Servomotors | |
| #8 | Separation | |
| #9 | Swimming pools | |
| #10 | Measuring electric variables |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ledoux John W | 35 |
| Publication | Filing date | Title |
|---|---|---|
| US1880206A | Meter | |
| US1892468A | Meter | |
| US1889994A | Meter | |
| US1374508A | Integrating mechanism | |
| US1268130A | Fluid-meter. | |
| US1243843A | Integrating mechanism. | |
| US1243842A | Fluid-meter. | |
| US1225978A | Proportional meter. | |
| US1225977A | Fluid-measuring mechanism. | |
| US1152189A | Loss-of-head gage. | |
| US1129209A | Liquid-meter. | |
| US1135119A | Fluid-meter. | |
| US1085348A | Mechanism for combining liquids. | |
| US1026324A | Fluid-meter. | |
| US1064748A | Fluid-meter. | |
| US1000022A | Valve mechanism. | |
| US1083689A | Fluid-meter. | |
| US1038768A | Fluid-meter. | |
| US1041107A | Indicator. | |
| US1043115A | Fluid-meter. |