Filter circuit for attenuating high frequency signals
CA 2098009 C · Owner: Agahi-Kesheh, Darioush · Inventors: Rabe, Duane Carl; Agahi-Kesheh, Darioush
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A low pass filter circuit (600) for a radiotelephone which filters harmonic spectral components of a modulated signal generated by the radiotelephone. The filter circuit is comprised of inductors and capacitors (602 660) wherein each inductor and, each capacitor of the filter is comprised of a distributed-element portion (604 666) and a discrete element portion (616 618, 664). The distributed element portions of each inductor and each capacitor of the filter attenuate higher-frequency spectral compo-, nents of a signal applied thereto. The discrete element components of each inductor and each capacitor of the filter attenuate lower-frequency, spectral components of the signal applied …
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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 September 23, 1992 and granted January 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2014.
- 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.