Second order active filters
CA 2017926 C · Owner: Nortel Networks Limited · Inventors: Popescu, Petre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A family of second order active filters is described. A general form of the filter comprises an input terminal, an output terminal and a common terminal, a first reactance and a resistance coupled in series between the input and common terminals a first amplifier, coupled from a connection point between the first reactance and the resistance to the output terminal, a first potential divider between the input terminal and one of the output and common terminals, a second amplifier coupled from a tapping point of the first potential divider via a second reactance to the connection point a second potential divider between, the output terminal the the common terminal …
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 30, 1990 and granted November 16, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 2012.
- 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.