Smoke alarm and air cleaning device
CA 2112099 C · Owner: Newtron Products Company · Inventors: Adelman, Roger; Duty, Michael S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air cleaner (12) with a smoke alarm unit (18) for a forced air recirculating system is disclosed. The smoke alarm unit (18) is housed within a module (16) that fits within the frame of the air cleaner (12) with minimal impact on the cleaning ability of the cleaner. In a preferred embodiment of the invention a battery capacity tester and air cleaner functionality detector (24) are included in the module. Signals from the battery tester and functionality detector (24) are used by the smoke alarm unit (18) to drive an alarm generator (40) with different signals to produce distinguishable alarms for a smoke condition low battery condi-, tion, and an air cleaner failure. A control unit (41) …
Read the whole patent
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
- Filed July 1, 1992 and granted May 20, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 1, 2014.
- 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.