Intruder alarm
CA 1097151 A · Owner: General Time Corporation · Inventors: Cielaszyk, Edward F.; Earls, David E.; Freeman, John D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An intruder alarm security device includes a source of fluid under pressure which serves as a medium for oscillating a diaphragm at the throat of a horn to create an audible warning signal. The intruder alarm includes an actuator a plunger, assembly and connecting structure for coupling rotary movement of the actuator to longitudinal movement of the plunger assembly to open communication between the diaphragm and the source of fluid. The coupling structure includes a lost motion connection so that the plunger assembly is controlled by the actuator only to the point of opening the communication. And the, plunger assembly includes an orifice member for metering the flow of medium to the …
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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
- Granted March 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 1998.
- 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.