Arrangement for providing a call-connection service
CA 2008905 C · Owner: American Telephone And Telegraph Company · Inventors: Palmer, Craig Frederick; Young, Robert Lee; Kittredge, Barbara Joanne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a private communication network served by a provider of call interconnection services, e.g. a carrier service node the number of trunks used within, a call path is reduced without affecting the private nature of the private network. The service provider serves customer calls by means of a service node controller (SNC) --a switch such as a PBX. The SNC directly interconnects trunks that connect it with a call-source and a call-destination node of the customer without routing the call, through the customer's tandem node. The SNC merely queries the customer's tandemnode over a control link such as an ISDN D channel, to obtain requisite call-routing information from the customer's database. …
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 January 30, 1990 and granted June 25, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2012.
- 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.