Surface mount circularly polarized wave antenna and communication apparatus using the same
CA 2273715 C · Owner: Itoh, Shigekazu · Inventors: Kawahata, Kazunari; Itoh, Shigekazu; Kushihi, Yuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a surface mount circularly polarized wave antenna which includes a substrate made of an insulation material and having a first main face a second main face, and at least one side face elongating between the first main face and the second main face; a first ground electrode disposed mainly on the first main face of the substrate; a radiation electrode disposed mainly on the second main face; a feeding electrode having a strip shape and so disposed as to elongate from the first main face side of the substrate on one side face of the substrate, and toward the second main face side one edge of the feeding electrode being positioned near to one side 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
- Filed June 4, 1999 and granted May 8, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 2021.
- 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.