Gain controller
CA 2207350 C · Owner: Nec Corporation · Inventors: Kaku, Tomoya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic gain controller controls the gain of a variable-gain amplifier based on an error signal which is corrected by a correction controller using discrete characteristic data which are sampled from a gain control characteristic of the variable-gain amplifier in sampling steps each being set depending on a variation of the gain control characteristic. The correction controller corrects the error signal based on continuous characteristic data generated from the discrete characteristic data stored in the memory so that the gain control characteristic of the variable-gain amplifier is substantially linear with respect to the error signal.
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 June 9, 1997 and granted August 15, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2019.
- 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.