Logarithmic periodic antenna
CA 2047113 A1 · Owner: Braathen, Russell E. · Inventors: Braathen, Russell E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A logarithmic periodic antenna is constructed with antenna elements implanted in a single plane in or on a surface of an insulating substrate. The substrate supports the coplanar antenna elements and keeps them in the desired configuration. The antenna elements are arranged in pairs with, the elements of a given pair being on alternate sides of a center conductor. The center conductor consists of two conducting strips, or feeders, which run down the middle of the antenna structure. Each of the feeders connects to a different one of a pair of elements, and each feeder connects to alternating elements of consecutive pairs, for example to the "left" ele-, ment of one pair and the "right" …
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 16, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 16, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 2013.
- 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.