Dielectric resonator, dielectric filter, dielectric duplexer, and communication device
CA 2260644 C · Owner: Murata Manufacturing Co. Ltd. · Inventors: Ise, Tomoyuki; Kubota, Kazuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dielectric filter comprising a case having an electroconductivty dielectric resonators each having electrodes formed on the opposite sides thereof disposed inside of the case, an ground plate disposed inside of the case, and external connecting means, at least one of the electrodes being a thin film, multilayered electrode connected to said ground plate wherein said ground, plate is provided with protuberant portions and each of the protuberant , portions is connected to the side of the dielectric resonator on which the thin film multilayered electrode is formed, through the surface portion of the protuberant, portion which is smaller than the range of the dielectric resonator defined …
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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 February 3, 1999 and granted August 6, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 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.