Half-wave folded cross-coupled filter
CA 2095413 C · Owner: Radio Frequency Systems, Inc. · Inventors: Bentivenga, Salvatore
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A folded high frequency resonant cavity filter 30 includes a filter housing 32 that, contains a half-wave resonator rod 36 64 and a plurality of evanescent mode resonator rods, 34, 34'. The half wave resonator rod 36 64 and plurality of evanescent mode , resonator rods 34, 34' are mounted to the filter housing 32 such that they all lie along a single plane. The filter housing 32 has an inner wall 42 that physically isolates two groups of evanescent, mode resonator rods 34, 34' from each other. An aperture 40 is formed in the inner housing, wall 42 between two physically opposing evanescent mode resonator rods 34' to allow a, capacitive cross-coupling to occur between the two …
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 3, 1993 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 3, 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.