| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 14 | |
| #2 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Machines | |
| #3 | Chemical engineering | |
| #4 | Packaging and shipping | |
| #5 | Mechanical elements | |
| #6 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Electrical vehicle propulsion | |
| #2 | Unspecified technologies | |
| #3 | Gearing | |
| #4 | Cranes | |
| #5 | Separating solids | |
| #6 | Goods for writing upon | |
| #7 | Parachutes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Walker John H | 14 |
| #2 | Crenshaw Clarence W | 2 |
| #3 | Walker James M | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB201301887D0 | Puddle fin | |
| US2764041A | Auxiliary transmission for tractors | |
| US2543391A | Crane for attachment to tractors | |
| US2351563A | Aircraft location instrument | |
| US1135743A | Combination-tool. | |
| US1029408A | Trolley. | |
| US941216A | Trolley-pole catcher. | |
| US899578A | Trolley-pole catcher. | |
| US904738A | Separator for coal. | |
| US825781A | Trolley. | |
| US787810A | Trolley-pole catcher. | |
| US761567A | Trolley. | |
| US761565A | Trolley mechanism. | |
| US761566A | Trolley. | |
| US761564A | Trolley. |