Radio communication equipment for a mobile station and traffic channel hand-off method using the same
CA 2030641 C · Owner: Ntt Mobile Communications Network Inc. · Inventors: Yamao, Yasushi; Tarusawa, Yoshiaki; Nojima, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In radio communication equipment for use in a mobile station, provision is made for selectively applying either one of the oscillation outputs of first and second local oscillators to a transmitting part and a receiving part by first and second RF switches respectively. In a traffic channel hand-off system for a mobile communication system in which each time the mobile station moves from a certain zone to another its traffic, channel is switched to another traffic channel of a different frequency, a control part responds to a traffic channel assigning signal from the current base station to allot an idle one of the local oscillators to the assigned channel, set the allotted local oscillator …
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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 November 22, 1990 and granted May 31, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 2012.
- 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.