| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 9 | |
| #2 | Canada | 1 | |
| #3 | Germany | 1 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Machines | |
| #3 | Chemical engineering | |
| #4 | Thermal processes | |
| #5 | Mechanical elements | |
| #6 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Measuring force, work and fluid pressure | |
| #2 | Separation | |
| #3 | Unspecified technologies | |
| #4 | Preheating for stem generation | |
| #5 | Weighing | |
| #6 | Unspecified technologies | |
| #7 | Venting or aerating devices | |
| #8 | Steam traps | |
| #9 | Water treatment | |
| #10 | Measuring volume |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wallem Axel B | 3 |
| #2 | Elfreth Harold D | 2 |
| #3 | Yoder Joseph D | 1 |
| #4 | Gibson George H | 1 |
| #5 | Gamble Joseph Willard | 1 |
| #6 | Gamble Joseph W | 1 |
| #7 | Dodd Gerald D | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1517877A | Valve | |
| GB196476A | Improvements in or relating to differential pressure gauges | |
| US1710474A | Weir meter | |
| US1504618A | Apparatus for water deaeration | |
| US1402277A | Water-treating process and apparatus | |
| US1456631A | Weighing machine | |
| US1347607A | Steam-trap | |
| US1409337A | Strainer valve for filters | |
| US1395981A | Water-heater | |
| US1438200A | Feed-water heater | |
| CA231882A | Differential pressure gauge | |
| DE400772C | Differential pressure meter |