Dielectric filter unit, transmitting/receiving-sharing unit, and multiplexer
CA 2215803 C · Owner: Ogura, Hiromi · Inventors: Ogura, Hiromi; Tsunoda, Kikuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A miniaturized dielectric filter unit exhibiting desired characteristics is formed in which a plurality of resonators are disposed within a dielectric block. A plurality of internal conductors are disposed within the dielectric block. An external conductor and an input/output electrode are formed on an outer surface of the dielectric block. A slit having an electrode therein which is, electrically connected to the input/output electrode is, provided each of between two adjacent through-holes having the internal conductors therein. Thus, unwanted coupling between the input/output sharing filters is prevented and, an external coupling circuit is configured by capacitive coupling. It is thus …
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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 September 18, 1997 and granted December 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2019.
- 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.