| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Packaging and shipping | |
| #2 | Electrical machinery and energy | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Elevators and escalators | |
| #2 | Unspecified technologies | |
| #3 | Magnets and transformers | |
| #4 | Electric switches |
| # | Name | Total Patents |
|---|---|---|
| #1 | Thurston Ernest B | 6 |
| #2 | Ohler Frank L | 3 |
| #3 | Brubaker John A | 2 |
| #4 | Turner Floyd F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1923683A | Safety device for elevators | |
| US1709970A | Elevator interlock | |
| US1707648A | Door-operating mechanism | |
| US1694663A | Elevator-gearing adjustment | |
| US1352926A | Alternating-current electromagnet | |
| US1352927A | Electric switch | |
| US1358776A | Gate-actuating mechanism | |
| CA264169A | Switch mechanism | |
| CA264170A | Control mechanism | |
| CA214478A | Elevator gate device | |
| CA246655A | Electro-magnet |