Filter, duplexer, and communication device
CA 2252364 C · Owner: Nakatani, Yukihiro · Inventors: Nakatani, Yukihiro; Nishiyama, Taiyo; Himi, Yoshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter includes a dielectric resonator a cavity for holding the dielectric resonator therein an external connector mounted on the cavity and a coupling loop connected to the external connector so as to electromagnetically couple with the dielectric resonator. The coupling loop is formed by bending a metal plate nearly into the shape of an L and is provided with a rib extending in a direction that is not parallel to the bending 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 November 3, 1998 and granted May 21, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 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.