Cable television master/slave decoder control
CA 1250656 A · Owner: Oak Industries, Inc. · Inventors: Li, Tony C.; Stubbs, Graham S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A method of controlling the operation of slave decoders in a cable television distribution system having a central control computer; in which each subscriber location having a slave decoder also has a master decoder; in which there is a control message connection between each master decoder and its associated slave decoder(s); and in which the central control computer can individually address each master decoder and each slave decoder The method includes the steps of transmitting control messages for the slave decoders at the control message frequency for the master decoders. In response thereto, each master decoder will retransmit the control message to its …
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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
- Granted February 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2006.
- 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.