Ultrasonic emergency call system
CA 2076685 A1 · Owner: Harbour, Luc · Inventors: Harbour, Luc; Leclerc, Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ultrasonic emergency call anti-agression system designed to indicate in which exact room a person requiring urgent help is located within a building. An ultrasonic receiver is installed in each room under surveillance. A miniature portable ultrasonic transmitter is distributed to personnel required to work in high risk areas. The miniature transmitter is equipped with a switch which when, activated, automatically transmits ultrasonic signals for a 20 second period. The signal activates only the receiver installed within the room where the person is located. Because of the transmission characteristics of the ultrasonic frequencies the, receivers installed in adjacent rooms are not …
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 August 21, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 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.