Scheme for power conservation in fire alarm system
CA 2013610 C · Owner: General Signal Corporation · Inventors: Sirois, Brian D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for conserving the alarm-state power supplied to a plurality of light emitting devices associated with respective terminal units in a fire alarm system or the like comprises a transmission line having a plurality of terminal units connected thereto. Each of the terminal units has comparison means for determining whether a received address signal coincides with an identification address stored in the terminal unit the comparison, means producing an output signal responsive to coincidence. A loop controller is connected to the transmission line for transmitting a plurality of address signals cyclically to the terminal units. Means are provided for selecting a blinking mode 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
- Filed April 2, 1990 and granted January 18, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2012.
- 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.