Emergency signal warning system
CA 2024951 A1 · Owner: Sy/Lert System Limited Partnership · Inventors: Sohie, Guy L.; Bernstein, Bernard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is an emergency signal warning system to detect the sirens of emergency vehicles and to provide a warning signal. The system of the invention detects the sound signals varying in frequency in a predetermined manner over a predetermined frequency range. The system includes a source of input signals which are converted from analog to digital. A digital signal processor processes and stores the output of the converter into groups of predetermined numbers of bits. An output representative of a characteristic of the signal at the source of the input signal corresponding to a predetermined number of said groups is produced. An alarm is produced when a predetermined pattern 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 September 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 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.