Strip line filter and duplexer filter using the same
CA 2095773 A1 · Owner: Tanoie, Kunihiro · Inventors: Komazaki, Tomokazu; Noguchi, Kazushige; Gunji, Katsuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compact, high performance strip line filter which may be made thinner than a dielectric filter having comparable performance characteristics. The strip line filter includes a rectangular box-shaped dielectric block having parallel, grooves formed in a front face with a predetermined spacing therebetween the, grooves extending from a top face to a bottom face of the block. A thin film outer conductive layer covers the side faces the back face, and the bottom face. Resonator conductors each formed of a thin film of conductive material cover, the respective surfaces of the grooves and are connected to the outer conductor.According to a further aspect a substrate, with capacitor formed …
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 May 7, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2015.
- 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.