Method and apparatus for activating magnetomechanical eas markers while preventing formation of demagnetization field
CA 2541740 A1 · Owner: Sensormatic Electronics Corporation · Inventors: Lian, Ming R.; Copeland, Richard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two-dimensional array of magnetomechanical markers (20) is adhered to a continuous web (62). A magnetizer element (70) is scanned (74) across the web (62) to, magnetize the bias elements in a group of markers (20) with a first polarity thereby, activating the group of markers. The web (62) is then advanced (68) and the magnetizer, (70) is scanned across the web in an opposite direction (76) to the previous scan to, magnetize the bias elements of a second group of the markers (20) with a second polarity, thereby activating the second group of markers. The web (62) is slit in a longitudinal, direction to produce web-strips each carrying a column of the activated markers. The, …
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 September 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 2019.
- 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.