Call transfer in a cellular telephone network
CA 2255053 A1 · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Foti, George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Streamlined initiation of a call transfer within a cellular telephone network (10) is effectuated by having the transfer-to C-number request (212) include not only an identification of the B-number (B) for the called mobile station (14(1)), but also an identification number (MSCID) of a switching node (12) presently handling the call. Responsive to receipt of this request the home , location register (20) processes the B-number to identify one or more Cnumbers for forwarding of the call. The home location register then determines which switching nodes currently serve the identified C-numbers and directly generates a routing request message (2 to 14) including the received present , …
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 May 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 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.