Variable gain amplifying device
CA 2189712 C · Owner: Nec Corporation · Inventors: Ichihara, Masaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable gain amplifying device for an AGC (Automatic Gain Control) circuit included in a receiver and having a broad dynamic range is disclosed. The device has a more linear gain-to-control voltage characteristic than the conventional device. Because the device broadens the range of control voltage without aggravating the deviation of the gain its gain-, to-control voltage characteristic is more stable than the characteristic of the conventional device.
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 6, 1996 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2018.
- 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.