Method and apparatus for maintaining directory services for a video transmission network
CA 2212477 C · Owner: Plater, Christopher · Inventors: Plater, Christopher; Fielding, William S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a video information transmission network having a plurality of nodes including at least one master node and a number of slave nodes responsive to master node; as well as an information directory containing directory information. The information directory includes a central directory associated with the master node and a number of slave directories, associated with the slave nodes. There is a directory maintenance updater associated with the information directory adapted to maintain information in the slave directories consistent with information in the central directory.
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 August 1, 1997 and granted February 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 2019.
- 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.