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Expired Canadian patentCanada

Communication system with voice announcement means

CA 1237800 A · Owner: Hitachi Telecom Technologies, Ltd. · Inventors: Akiyama, Tadahiko

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A communication system renders improved service for users by announcing in a vocal message information about the call such as the called person's name, calling person's name and class of urgency of the call during the phase or ring. For paging the called person's name, a directory number assigned to each of telephone users is dialled, or for notifying the calling person's name, a memory card such as a magnetic card memorizing the identification code of a calling person is set on a calling terminal device, so that necessary information is transferred to the switching system. The information is edited and synthesized into a vocal message in the switching system or in each terminal device …

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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

  • Granted June 7, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 28, 1984
GrantedJune 7, 1988
Term endedJune 7, 2005
Patent numberCA 1237800 A
Classification (IPC)H04M3/42 +2 more

Timeline

Timeline From CIPO dates

1985198819911994199720002003Application filedNov 28, 1984Patent grantedJune 7, 1988Term endedJune 7, 2005

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.