Audience measurement system for digital television
CA 2289519 C · Owner: Nielsen Media Research, Inc. · Inventors: Feininger, William A.; Kempter, Paul C.; Lu, Daozheng
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A television audience measurement system measures viewing of a television program viewed on digital television located in a statistically selected site by (i) retrieving an audience measurement data packet from a television set in order to identify the television program (ii) detecting an audio code , embedded in the television program in order to identify the television program, (iii) extracting an audio signature from the television program in order to identify the television program (iv) identifying the television , program through use of a software agent and (v) selecting at least one of the retrieving means, the detecting means, the extracting means and the software , agent in …
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 9, 1998 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2020.
- 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.