Communications system having voice and digital data capability and employing a plurality of voice and data buses in main service unit and serial packetized transmission to and from telephones

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Listed from its IP Australia record in Patent Yard's archive of Australian patents past their term. Its claims, description and drawings are in the AusPat record and on Google Patents, and the Claude kit works from them.

Why it's free to use

• Filed October 29, 1987 and granted September 18, 1990. An Australian standard patent lasts 20 years from its date of patent, which is at most a year after this filing, so its term ended by October 29, 2008.
• A pharmaceutical extension adds at most five years, so even that would have ended by October 29, 2013.
• We check Australian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.