Monitoring system
CA 1185001 A · Owner: Wylie (Glen J.) & Associates Ltd. · Inventors: Rapoport, Isaac
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of detecting the presence of an object in a supervised area is described. The method involves generating a pulsed ultrasonic signal with an acoustic signal generator and directing the signal towards the supervised area. detector spaced a short distance from the generator is used to detect reflected signals produced in response to the ultrasonic signal, and a level signal indicative of the intensity of the detected signals is generated. The level signal is compared with a threshold signal during a predetermined time interval corresponding to the expected travel time range of signals reflected from the supervised area and when the threshold signal is exceeded a signal indicating, 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 April 2, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 2, 2002.
- 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.