| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 | |
| #2 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Non-positive-displacement pumps | |
| #2 | Steam turbines | |
| #3 | Unspecified technologies | |
| #4 | Venting or aerating devices | |
| #5 | Steam engine plants | |
| #6 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hedlund Per Johan | 14 |
| Publication | Filing date | Title |
|---|---|---|
| US906133A | Torpedo. | |
| US883404A | Steam-turbine. | |
| US940874A | Elastic-fluid turbine. | |
| US797058A | Centrifugal-pump lining. | |
| GB190413376A | Improvements in Elastic Fluid Turbines. | |
| US858869A | Steam-turbine. | |
| US754447A | Steam-turbine. | |
| US767689A | Steam-turbine. | |
| US764586A | Steam-turbine. | |
| US743869A | Elastic-fluid turbine-wheel. | |
| US741491A | Steam-turbine. | |
| US742423A | Steam-turbine. | |
| US761226A | Steam-turbine. | |
| US742422A | Regulator for steam-turbines. |