| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Machines | |
| #3 | Environmental technology | |
| #4 | Machine tools | |
| #5 | Mechanical elements |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ward Hall Charles | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US1847559A | Metallic construction for aircraft and the like | |
| US1760644A | Landing gear for airplanes | |
| US1839919A | Seamless hollow metallic section and process of making the same | |
| US1656193A | Airplane | |
| US1654078A | Muffler for gas engines | |
| US1658438A | Propeller | |
| US1857754A | Riveted joint | |
| US1678640A | Fitting for aircraft and the like | |
| US1609468A | Metallic construction for aircraft and the like | |
| US1647619A | Airplane | |
| US1562549A | Airplane | |
| US1463888A | Aircraft fitting | |
| US1431520A | Aeroplane |