A small helical antenna with non-directional radiation pattern
CA 2232064 C · Owner: Nec Corporation · Inventors: Kuramoto, Akio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A small helical antenna with broad fan radiation pattern provides easy impedance matching and high radiation efficiency. It is composed of a dielectric cylinder a, plurality of radiation conductors arranged on the outer surface of the dielectric cylinder, a matching conductor arranged on the upper inner surface of the dielectric cylinder that cancels inductive reactance and a plurality of, feeder conductors arranged near the radiation conductors on the lower inner surface of the dielectric cylinder and lowering the impedance of the helical antenna.
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 March 13, 1998 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2020.
- 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.