Patent · US Expired

Smoke detector ionization chamber

US4189644A · kind A · utility

4Cited by
3References
14Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 23, 1977
Grant dateFeb 19, 1980
Priority date—
Expiry dateNov 23, 1997

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG08B17/113
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

An ionization chamber of the type used in an ionization smoke detector is made adjustable. The chamber has two electrodes and one radioactive source for ionizing the electrode gap. One of the electrodes is laterally displaceable relative to the other. As a result of displacement of this electrode, areas of the electrode with differing geometrical configurations can be brought into the ionization zone of the radioactive source. Several different embodiments of the electrode with different geometrical configurations are described.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.