Smoke detector self-test
US12198531B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 2022 |
| Grant date | Jan 14, 2025 |
| Priority date | — |
| Expiry date | Sep 9, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Example implementations include a smoke detector comprising a smoke chamber; an LED that generates light in the smoke chamber; a photodetector configured to detect whether a threshold amount of light is scattered by smoke particles in the smoke chamber; and one or more self-testing components configured to re-direct the light from the LED toward the photodetector for self-testing the LED and the photodetector. Some further implementations include one or more masking self-test components configured external to the smoke chamber to direct light from outside the smoke chamber into the smoke chamber and toward the photodetector for determining whether the smoke detector has been masked. Some further example implementations include a method comprising controlling one or more self-testing components of a smoke detector to re-direct at least a portion of light from an LED toward a photodetector; and determining whether the photodetector causes an alarm trigger in response to the controlling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.