Band elimination dielectric filter, dielectric duplexer and communication device using the same
CA 2257754 C · Owner: Kubota, Kazuhiko · Inventors: Kubota, Kazuhiko; Ise, Tomoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A band elimination dielectric filter in which the non loaded Q is increased by approximately eliminating the actual current flowing in a shield cavity and the height is, reduced, is provided. The band elimination dielectric filter includes a conductive shield cavity 11 a dielectric, resonator 12 which is arranged in the shield cavity 11 and in which electrodes 18 are formed on two surfaces opposite to each other; and an external coupling means 13 which is arranged in the shield cavity and connected to the dielectric resonator 12.
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 January 4, 1999 and granted August 5, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 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.