Ionization smoke detector with controlled sensitivity
CA 1081870 A · Owner: Emhart Industries, Inc. · Inventors: Dobrzanski, John J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ionization smoke detector is provided with a ventilated sensing chamber and housing which cooperate to improve and control smoke sensitivity by reducing adverse effects of external winds or drafts. The detector includes a housing having arcuate openings arranged in a circle and a flared deflector mounted with in the circle in order to direct smoke and other particulate matter into the interior of the housing. A smoke sensing chamber is positioned within the housing adjacent the openings and has a cylindrical shell electrode defining arcuate ventilating apertures registering with the arcuate openings of the housing to pass smoke and particulate matter in and out of the chamber in …
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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 July 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 1997.
- 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.