High-frequency transmission line, dielectric resonator, filter, duplexer, and communication device
CA 2249489 C · Owner: Murata Manufacturing Co. Ltd. · Inventors: Ishikawa, Yohei; Matsui, Norifumi; Hidaka, Seiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a high-frequency transmission line and a dielectric resonator having a small size and having an effectively reduced loss. When a transmission line is produced, an electrode is formed on a dielectric plate in such a manner that one or more gaps are formed in an edge portion of the electrode along an edge of the electrode thereby forming thin line-shaped electrodes whereby a current which would otherwise be concentrated to a great extent in the edge portion of the electrode is divided into a plurality of portions.
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 October 2, 1998 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2020.
- 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.