Circular polarization selective surface made of resonant spirals
CA 2062029 A1 · Owner: Morin, Gilbert A. · Inventors: Morin, Gilbert A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A Circular Polarization Selective Surface (CPSS) for circular polarized electromagnetic waves is formed from a number of resonating elements arranged in a plane. This type of surface may be used in a wide range of reflector antennas. Each resonating element is formed from a number of electrically conductive segments connected end-to-end one to the other with each segment having a predetermined length and having a total approximate length of 1 .lambda.. A central segment having a length of about 1/4 .lambda. determines the resonant frequency for the element. This central segment extends parallel to the z-axis of a right-hand set of three mutually perpendicular axis x; y and z wherein 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
- Filed February 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2014.
- 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.