Combination ionization and photoelectric smoke detector
US4469953A · kind A · utility
27Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1982 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Feb 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A combination type smoke detector comprising a light scattering smoke detector and an ionization smoke detector in which a labyrinth structure dark chamber for the light scattering smoke detector is made of an electroconductive plastic material and functions as the outer electrode of the ionization smoke detector is disclosed. Members of the ionization smoke detector and the light emitter and the light sensing element for the light scattering smoke detector are arranged so that the light emitted from the light source and reflected by said members and the lamina members does not enter the light-sensing element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.