Antenna devices
CA 2129139 C · Owner: Ntt Mobile Communications Network Inc. · Inventors: Tsunekawa, Koichi; Hagiwara, Seiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Double-resonance characteristics are obtained with a small and simple construction by arranging a conductive planar radiation element approximately parallel, to a conductive ground plane with an intermediary insulator connecting a feed , line to, these, and further connecting a parasitic line to a separate contact point at a distance, from the contact point of the feed line.
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 December 7, 1993 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2015.
- 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.