High fidelity regenerative amplifier with phase correction circuit
CA 2005228 C · Owner: Ohkuma, Saburoh · Inventors: Ohkuma, Saburoh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high fidelity regenerative amplifier with a phase correction circuit has a frequency characteristic which is flat over as wide a frequency range as possible and a phase characteristic suitable for a characteristic of the sound field in which regenerated sound is reproduced. In order to achieve such characteristic, an amplifier which amplifies regenerated sound with high fidelity is preceded by a phase correction circuit connected thereto to correct the phase characteristic of the amplifier over a wide frequency range. The phase correction circuit includes an equalizer having medium frequency and high frequency correction circuits having a characteristic such that a phase of an input aural …
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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 12, 1989 and granted December 7, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 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.