Mobile communication without call interruption during transition between outdoor and indoor modes
CA 2195375 C · Owner: Fujita, Toshiki · Inventors: Fujita, Toshiki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a mobile communication system having a base station and a mobile station, indoor and outdoor antennas are provided in different locations of a building structure that substantially prevents penetration of electromagnetic radiation. A communication unit is connected between the indoor and outdoor antennas. The communication unit is arranged to detect a signal received at the first antenna from the mobile station while the mobile station is communicating with the base station determines, that the mobile station is entering the structure when the detected signal exceeds a predetermined reference level and establishes a radio link between the outdoor antenna and the base station and a …
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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 January 17, 1997 and granted October 3, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 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.