Alarm system
CA 2122173 C · Owner: Zaltsman, Vladimir · Inventors: Micallef, George Saviour; Kriete, Richard John; Zaltsman, Vladimir
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An alarm system is described wherein both an open connection between an alarm monitor and an alarmed unit or a short circuit across the connection between the monitor and the unit can be detected. A controllable normally open test, device is placed in parallel with a normally open alarm contact. If current flows when the test device is open, either a short circuit or an alarm condition exists. If current does not flow when the test device is closed an open connection between the, monitor and the unit exists. Advantageously the integrity of connections between, alarm monitors and alarmed units is enhanced.
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 April 26, 1994 and granted October 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2016.
- 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.