Smoke detector
CA 1115377 A · Owner: Cerberus Ag · Inventors: Tresch, Erwin; Ackermann, Hans; Horvath, Zoltan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
INVENTORS: ZOLTAN HORVATH, J?RG MUGGLI HANS ACKERMANN, and ERWIN TRESCH, INVENTION: SMOKE DETECTOR ABSTRACT OF THE DISCLOSURE, A smoke detector especially for a fire alarm, comprising a radiation source possessing a substantially conical ring-shaped radiation characteristic or pattern and a radiation receiver arranged along the axis of the radiation source but externally of the direct radiation. The radiation receiver receives radiation which is scattered by smoke particles within the conical ringshaped radiation region. In order to reduce the spurious radiation impinging the radiation receiver the radiation region is bounded by elements located externally of the direct receiving region of …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 29, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.