Method and apparatus for establishing connections in a communications access network
CA 2115089 C · Owner: American Telephone And Telegraph Company · Inventors: Debruler, Dennis L.; Murphy, Douglas John; Hodgdon, David Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A communications switch (311) communicates a message to a particular access network endpoint (O~Ei) by forwarding an identification of that endpoint along with the message, link-by-link, through the access network the forwardingbeing accomplished by using previously stored routing information identifying at, the switch and at each cross-connection point (350 370), a particular downstream, link over which the endpoint can ultimately be reached. The links (345 365), connecting the cross-connection points are multiplexed links supporting digital loop carrier and fiber-in-the-loop communications. The routing information is generated and stored automatically by having each network element report …
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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 February 7, 1994 and granted July 7, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2016.
- 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.