Television system for the interactive distribution of selectable video presentations
CA 2015912 C · Owner: Liberate Technologies Canada Ltd. · Inventors: Pocock, Terrence H.; Mcnorgan, Richard; Lodberg, Allan E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interactive television system, comprises a centrally located presentation system for transmitting video presentations via a television distribution network over at least one channel on the network in which each presentation includes a plurality of individual images and an optional audio segment, and a plurality of remotely Located terminals for receiving the video presentations transmitted over said network and for transmitting information to said presentation system via telephone lines designating desired presentations to be transmitted. The system comprises: a storage system for storing, in digital form individual images and audio segments; an audio system for receiving the information …
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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 May 2, 1990 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 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.