| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Control | |
| #3 | Electrical machinery and energy | |
| #4 | Medical technology | |
| #5 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Sound-producing devices | |
| #2 | Alarm systems | |
| #3 | Operating tables | |
| #4 | Unspecified technologies | |
| #5 | Electric switches |
| # | Name | Total Patents |
|---|---|---|
| #1 | Harald Ekman Olof Ingemar | 12 |
| #2 | Teodor Nicou Hans | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US2696603A | Two-wire alarm or control system | |
| US2724105A | Electric control or alarm systems | |
| US2599441A | Thermocontact or fuse for alarm purposes | |
| US2324685A | Resilient stretcher-supporting device for vehicles | |
| US2249891A | Electric alarm system | |
| US2174125A | Siren | |
| US2110522A | Siren | |
| US2110505A | Siren | |
| US2101385A | Air horn | |
| US2130716A | Siren | |
| US2114654A | Siren | |
| US2059510A | Automatic alarm system |