Synchronizing signal separating circuit
CA 2013532 C · Owner: Hosoya, Nobukazu · Inventors: Amino, Tadashi; Hosoya, Nobukazu; Ishii, Takaaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A synchronizing signal separating circuit inverts and amplifies, in an inverter 12, a composite video signal received from a video amplifying circuit 100 through a coupling condenser 1. An output node B of the inverter 12 is connected to an input node A of the inverter 12 through a switch 14 and a bias resistor 10. A bias resistor 11 is connected between the input node A and a ground potential. An output of the inverter 12 is further inverted and amplified by an inverter 13 and outputted as a composite synchronizing signal and also supplied to a control input of the switch 14. As a result, the switch 14 is turned on in a synchronizing signal period, so that the coupling condenser 1 is …
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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 March 30, 1990 and granted February 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 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
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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.