Deactivatable coded marker and magnetic article surveillance system
CA 1294017 C · Owner: Controlled Information Corporation · Inventors: Weaver, Jon N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, A deactivatable coded marker for use in article surveillance systems has an electrically conductive element at least partly surrounding the core, by reason of which the marker will generate a phase shifted harmonic signal responsive to a reference signal. A magnetizable element of high coercivity is adjacent to and overlying the electrically conductive material, the marker generating the phase shifted harmonic signal when the high coercivity element is not magnetized but generating a non phase shifted harmonic signal responsive to the reference signal when the high coercivity element is magnetized, whereby the high coercivity element neutralizes the effect of 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 January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 2009.
- 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.