Method and apparatus for determining audience viewing habits
CA 1314622 C · Owner: A. C. Nielsen Company · Inventors: Zurlinden, Everett V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tract of the Disclosure A method and apparatus for determining the channel of a plurality of predetermined channels to which a remotely controlled receiver is tuned. A viewer transmitter device includes a keyboard for receiving viewer entered selections and a remote transmitter which transmits infrared, ultrasonic radio, frequency or other radiated control signals for each of the viewer selections. A receiver device in a channel detection system receives a signal in the selected transmission medium, and immediately signals a jamming device to broadcast interference which precludes the remotely controlled receiver from identifying and acting upon the transmitted control signal. The …
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
- Granted March 16, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 16, 2010.
- 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.