Tuner station selecting apparatus
CA 2010176 C · Owner: Usui, Akira · Inventors: Kubo, Kazuhiko; Mishima, Akira; Usui, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a tuner station selecting apparatus. The apparatus is comprised of a first mixer for mixing an output signal from a first local oscillator with an input signal, and a second mixer for mixing an output signal from a second local oscillator with a signal from the first mixer. The apparatus further includes a first phase locked loop circuit that includes a first pre-frequency-divider to which the output signal of the first local oscillator is fed, a first variable frequency divider to which the signal from the first pre-frequency-divider is fed with, the frequency division ratio being variable a first phase, comparator to which the output signal of the first …
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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 February 15, 1990 and granted January 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 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.