Band-pass passive filter
CA 2004184 A1 · Owner: Thomson Hybrides · Inventors: Budan, Henri; Grosjean, Alain; Algani, Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a band-pass passive filter made by means of microstrips on a dielectric substrate. This filter is formed by at least three mutually parallel microstrips, one end of which is grounded. At least two non-adjacent microstrips are coupled by a coupling impedance Z. The distances x , x , x , x of the 1 2 3 4, fastenings, on the microstrips of the input, coupling, impedance Z and output set the impedances and characteristics of the filter. A first improvement enables the pass band to be contracted by means of a, high impedance, parallel mounted on the input of the filter. A second impedance, series mounted on the input, corrects the input impedance modification. second improvement …
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 November 29, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- 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.