Mobile communication system
CA 2225241 C · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Uchida, Yoshinori; Matsumoto, Shinji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mobile communication system implementing a frequency sharing and a time slot sharing using communication signal including a plurality of TDMA signals and/or the time divided CDMA signals, to supply the mobile communication system with an improved overall communication quality. The system includes the communication signal from a plurality of multiple access method for sharing frequency and time. A TDMA signal identified by synchronization word code has a different synchronization word code from each other which, is assigned to the same frequency and time slot. A time divided CDMA signal is frequency spreaded by spreading codes which is assigned to time divided time slot. The system also …
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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 December 18, 1997 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 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.