Patent · US Expired

Smoke detector with a conical ring-shaped radiation region

US4181439A · kind A · utility

28Cited by

5References

27Claims

0Family size

Assignee

Cerberus AG · CH

Inventors

Erwin Tresch · Männedorf, CH
Zoltan Horvath · Männedorf, CH

Key dates

Filing date	Mar 14, 1977
Grant date	Jan 1, 1980
Priority date	—
Expiry date	Mar 14, 1997

Classification

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

Abstract

An optical smoke detector comprising a radiation source which transmits radiation into a predetermined spatial region and a radiation receiver to which there is delivered the radiation which is scattered by particles located along the radiation path. The radiation source possesses a substantially conical ring-shaped radiation characteristic or pattern and the radiation receiver is arranged substantially at or along the cone axis.

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