Expired Canadian patentCanada
Automatic fine tuning circuit
CA 2020839 C · Owner: Oda, Osamu · Inventors: Ishiguro, Satoshi; Oda, Osamu
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic fine tuning (AFT) circuit is provided in, which at least during channel selection period an AFT, detecting period is made longer than one vertical scanning period, whereby an AFT operation can be pulled in satisfactorily and rapidly.
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 July 10, 1990 and granted February 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 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.
FiledJuly 10, 1990
GrantedFebruary 22, 2000
Term endedJuly 10, 2010
Patent numberCA 2020839 C
Classification (IPC)H04N5/50 +1 more
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.