Radio frequency filter
CA 2116375 A1 · Owner: Turunen, Aimo · Inventors: Jantunen, Heli; Turunen, Aimo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter,particularly suitable for radio frequency applications comprises a first filter which,in turn,comprises at least a pair of intercoupled resonators (RES1,RES2),and a SAW filter (SAW) which is coupled between the two intercoupled resonators so that a signal input to the filter at its input (IN) is coupled through the SAW filter to provide an output signal at its output (OUT).This provides a filter with all the advantages of a SAW filter,but with the ability to withstand the high power requirements of radio frequency applications.If three or more resonators are present in the first filter,then an amplifier can also be integrated in the filter.The SAW filter (and the amplifier if …
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 February 24, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2016.
- 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.