Dual ionization chamber
US4245174A · kind A · utility
1Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1978 |
| Grant date | Jan 13, 1981 |
| Priority date | — |
| Expiry date | Apr 24, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In an electronic smoke sensing and alarm device, a dual ionization chamber arrangement comprises a single source of radioactive material and first and second chambers separated by a common electrically conductive electrode. A portion of the radioactive material ionizes the air in the first chamber and another portion of the radioactive material ionizes the air in the second chamber. This arrangement provides an accurate control on the current flow through each chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.