Method and system for providing isdn connection service to mobile communications system
CA 2235560 C · Owner: Nitta, Toshio · Inventors: Nitta, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mobile communications system includes a switch connected to an inter-working unit and a circuit switching signaling converter. The inter-working unit includes a first terminator for terminating a first transfer procedure of user information for wireless transmission and a first interface to the ISDN for the user information according to ITU-T Recommendation V.110. The circuit switching signaling converter includes a second terminator for terminating a second transfer procedure of a circuit switching signal for wireless transmission and a second interface to the ISDN for the circuit switching signal according to ISDN User Part (ISUP) of common channel signaling system No. 7.
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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 April 21, 1998 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 2020.
- 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.