Circular magnetic target for an electronic article surveillance system
CA 2178901 C · Owner: Dutch A & A Trading B.V. · Inventors: De Nood, Cornelis Simon Adriaan; Batterink, Henri; Angel, Willem
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Transponder for a detection system, which comprises a transmitter for the production of a magnetic alternating field having predetermined frequency, and a receiver. The receiver is provided with a detector which is able to detect predetermined higher harmonics of the frequency of the alternating field. The transponder comprises a signal element made of soft magnetic material. When the transponder is placed in the magnetic alternating field higher harmonies of the frequency of the alternating field are generated by the signal element The signal element is in the form of a circle.
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 December 8, 1994 and granted August 15, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 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.