High-frequency tunable filter
CA 2092667 A1 · Owner: Duflot, Bernard · Inventors: Duflot, Bernard; Byzery, Michel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The filter comprises first and second oscillating circuits tuned by voltage-controlled varicap diodes. It comprises varicap diodes coupled between the first and second varicap diodes. The varicap diodes for the tuning of the oscillating circuits and the coupling varicap diodes between the first oscillating circuit and the second oscillating circuit are controlled by a same control voltage to obtain the tuning of the filter to its working frequency and the critical coupling of the two oscillating circuits. Application: portable radio transceivers. FIGURE 1
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 March 12, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.