| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 9 | |
| #2 | Canada | 2 | |
| #3 | France | 2 | |
| #4 | Germany | 1 | |
| #5 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Chemical engineering | |
| #3 | Mechanical elements | |
| #4 | Control | |
| #5 | Basic materials chemistry | |
| #6 | Engines, pumps and turbines | |
| #7 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Measuring volume | |
| #2 | Separation | |
| #3 | Clutches and brakes | |
| #4 | Venting or aerating devices | |
| #5 | Systems controlling non-electric variables | |
| #6 | Unspecified technologies | |
| #7 | Gas, coke and tar production | |
| #8 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wilkin John T | 7 |
| #2 | Houghton Carl R | 3 |
| #3 | Houghton Carl Roy | 3 |
| #4 | Coldwell Clarence B | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1815639A | Flexible coupling | |
| GB222442A | Improvements in or relating to gas meters | |
| US1528728A | Meter | |
| US1526293A | Governor | |
| US1232464A | Dust-separator. | |
| US1341696A | Proportional governor | |
| US1189766A | Impeller pump or blower and driver therefor. | |
| US1105868A | Extractor of liquids and solids from gases. | |
| US1101493A | Combination-pump. | |
| US1087906A | Relief-valve. | |
| CA281967A | Toothed gear | |
| CA251238A | Gas meter |