| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 4 | |
| #2 | Germany | 3 | |
| #3 | United States | 3 | |
| #4 | United Kingdom | 2 | |
| #5 | Japan | 2 | |
| #6 | Australia | 1 | |
| #7 | Republic of Korea | 1 |
| # | Industry | |
|---|---|---|
| #1 | Control | |
| #2 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Alarm systems | |
| #2 | Measuring electric variables |
| # | Name | Total Patents |
|---|---|---|
| #1 | Larsen Larry D | 7 |
| #2 | Larsen Larry Dale | 4 |
| #3 | Rarii Deiru Raasen | 2 |
| #4 | Larsen L | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1067215A | Smoke sensing fire alarm | |
| CA1071774A | Smoke sensing fire alarm | |
| US4246572A | Detection circuit with hysteresis | |
| KR800000400B1 | Smoke sensing fire alarm circuit | |
| US4075487A | Ionization chamber assembly | |
| US4083037A | Detection circuit |