Electronic article surveillance antenna coils with variable wind_geometry
CA 2453244 A1 · Owner: Tryer, Mark · Inventors: Fernandez, Gilbert; Valade, Franklin H. Jr.; Lopez, Pedro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An EAS antenna (1) having uniform antenna thickness along the antenna height is provided. The antenna contains at least two overlapping coils (2) where the individual coil cross-section are variable with respect to the circumference. If the individual coil thickness is halved at the overlap (8) the antenna , will have uniform thickness along the antenna height. This is accomplished by reducing the number of wire turns per layer along one or more sections of the coil, and simultaneously increasing the number of wire layers on the same sections.
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 July 31, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2024.
- 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.