Addressable control system for catv program distribution
CA 2039976 C · Owner: Chenoweth, John Stephen · Inventors: Tinguely, Paul R.; Martin, Thomas F.; Chenoweth, John Stephen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Remote control of subscriber access to premium programs on a cable television system or the like is provided. A signal path carries program signals received from a cable television system. A switchable port coupled to the signal path is identified by a logical channel number. First data are received and stored from the cable television system assigning a service code to the logical channel. Second data are received and stored from the cable television system identifying authorized service nodes. The assigned logical channel service code is periodically compared to the stored authorized service codes to determine if the logical channel is authorized. The port is switched to provide or deny …
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 April 8, 1991 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2013.
- 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.