| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Packaging and shipping | |
| #2 | Machines | |
| #3 | Machine tools | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Winches | |
| #2 | Elevators and escalators | |
| #3 | Unspecified technologies | |
| #4 | Gearing | |
| #5 | Turning | |
| #6 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wilson Alexander H | 10 |
| #2 | Barker Wendell A | 3 |
| #3 | Jule Hanna Ellsworth | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1919818A | Automatic control for hoisting machines | |
| US1816884A | Safety brake | |
| US1797034A | Safety device for elevators | |
| US1782703A | Portable hoisting machine | |
| US1756964A | Clutch-operating means | |
| US1623147A | Hoisting machine | |
| US1651569A | Hoisting machine | |
| US1621700A | Hoisting machine | |
| US1509510A | Chuck | |
| US1590790A | Hoisting machine | |
| US1178702A | Mechanical movement. | |
| US1141679A | Electrically-driven hoist. | |
| US1155784A | Hoisting-machine. | |
| CA306604A | Safety brake |