Telephone system having land-line supported private base station switchable into cellular network
CA 2259273 C · Owner: At&T Wireless Services, Inc. · Inventors: Leuca, Ileana A.; Buhrmann, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A telephone system includes at least one mobile station for communicating with a wireless cellular phone network at a private base station that registers a mobile station and enables communication of a mobile station with a land-line telephone network through the private base station. The private base station is responsive to pre-determined signaling codes received from a registered mobile station for switching the communication of the private base station into the wireless cellular phone network. The private base station includes a memory for storing calling numbers received from a land-line network. A dialer generates calls to a stored calling number through the wireless cellular …
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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 June 24, 1997 and granted March 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 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.