Asymmetric data communications system permitting subscriber interaction
CA 2778121 C · Owner: Bellsouth Corporation · Inventors: Dunn, Roy Curtis; Danner, Fred Thomas, Iii; Bergen, Richard Sammis, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An asymmetrical data communications system (ADCS) provides point-to-multipoint television programming including conventional television programming near video-on-demand (NVoD) or video-on-demand (VoD) and the full variety of available programming via a compressed, digitized UHF transmission. A program subsystem of the ADCS receives programming from content providers and processes the received signals for channel and VoD or NVoD service then sends the aggregated signal to a transmission subsystem that modulates channelizes, amplifies, filters and broadcasts the digital UHF signals over the air. Subscribing viewers are equipped with an intelligent control box (ICB) suitably configured to …
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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 23, 1996 and granted January 28, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2018.
- 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.