Antenna device
CA 2358875 A1 · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Ohwada, Tetsu; Endo, Tsutomu; Nishino, Tamotsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An antenna device provided with a matching circuit (4) for accommodating reflection coefficients of antenna elements (1a 1b, 1c, 1d), the reflection , coefficients being defined in consideration of connections among the antenna elements (1a, 1b, 1c, 1d) when each of the antenna elements is excited according to an excitation frequency and excitation phase corresponding to each frequency in operation.
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 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 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.