Apparatus and methods for conducting group calls in wireless communications systems
CA 2371139 A1 · Owner: Dailey, Timothy E. · Inventors: Dailey, Timothy E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A group call is conducted in a wireless communications system including a plurality of distributed transceiver units e.g. radio heads of a private , wireless system each of which are operative to communicate with terminals over a plurality of communications channels. A group call origination message is transmitted from an originating terminal preferably in response to a user , input at the originating terminal more preferably in response to actuation of a push-to-talk (PTT) device at the originating terminal. The transmitted group call origination message is received at a transceiver unit and in response, a , group call traffic channel designation messages addressed to a group of …
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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 17, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 17, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2022.
- 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.