Double helix antenna system
CA 2199724 C · Owner: Qualcomm Incorporated · Inventors: Wallace, Raymond C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A double helix antenna (10) comprised of orthogonally-wound helix conductors. The double helix antenna (10) includes a first helix conductor (14) wound in a first direction about a vertical axis, V of the double helix antenna (10). A , second helix conductor (18) is wound in a second direction about the vertical axis, V. In a specific implementation, the first and second helix conductors (14 and 18) are of different lengths, respectively corresponding to first and second frequency bands. Additionally, the first and second helix conductors (14 and 18) are wound so as to be orthogonal at those horizontal planes within which the first and second helix conductors (14 and 18) intersect or …
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 June 17, 1996 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2018.
- 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.