Gain controller
CA 2006288 C · Owner: Yamasaki, Hidenori · Inventors: Yamasaki, Hidenori; Naito, Jiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved gain controller for use in an audio equipment for controlling a gain of an audio signal without causing any clipping distortion and keeping a good S/N ratio. The gain controller is accordance with this invention comprises a tone controller for setting a frequency characteristic for attaining a preferable tone, a first electronic volume controller arranged at the front stage of the tone controller for attenuating an input signal, a second electronic volume controller arranged at the rare stage of the tone controller for attenuating the signal therefrom and a microprocessor for controlling the first electronic volume controller the second electronic volume controller and the tone …
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 December 21, 1989 and granted July 20, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.