| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Canada | 3 | |
| #3 | France | 3 | |
| #4 | Germany | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Venting or aerating devices | |
| #3 | Preheating for stem generation | |
| #4 | Steam generation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Kelly John F | 7 |
| Publication | Filing date | Title |
|---|---|---|
| US1596047A | Self-grinding valve | |
| US1640040A | Self-grinding valve | |
| US1442221A | Water-level controller | |
| US1455211A | Boiler-water-level controller | |
| CA242280A | Self grinding valve | |
| CA230068A | Boiler controller | |
| CA228730A | Boiler water level controller |