| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 15 |
| # | Industry | |
|---|---|---|
| #1 | Packaging and shipping | |
| #2 | Civil engineering | |
| #3 | Electrical machinery and energy | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Elevators and escalators | |
| #2 | Doors and windows | |
| #3 | Shafts | |
| #4 | Electric motor controls |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lindstrom Nils O | 8 |
| #2 | Olofson Carl F E | 4 |
| #3 | Jackson Jr Joseph R | 2 |
| #4 | Gottfrid Persson Lars | 2 |
| #5 | See Alva B | 1 |
| #6 | Nyburg Richard L | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1980230A | Elevator | |
| US1924690A | Cable equalizer | |
| US1879357A | Bearing | |
| US1990665A | Drive mechanism | |
| US1872803A | Elevator car guide | |
| US1839235A | Safety device for elevators | |
| US1909886A | Motor control | |
| US1905742A | Electric elevator system | |
| US1872770A | Elevator door system | |
| US1895253A | Elevator control device | |
| US1721998A | Collapsible gate | |
| US1699625A | Elevator-control device | |
| US1718649A | Collapsible gate | |
| US1934867A | Elevator gate | |
| US1700137A | Safety device for elevators |