Alarms
CA 2270984 C · Owner: R. Stahl Schaltgerate Gmbh · Inventors: Fagence, David Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An alarm device (10) incorporates a sounder (11) and a strobe (12). The sounder and the strobe are controlled by a circuit board (17) that is located within a single flameproof housing (13). A pressure unit (23) produces the sound for the device with the sound passing through a sintered disc (24) into an upwardly and outwardly diverging cone (25) from the top of which the sound is reflected outwardly and downwardly within a dome (26). A ramp (27) then assists in reflecting and emitting the sound.
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 October 28, 1997 and granted August 19, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2019.
- 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.