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Expired Canadian patentCanada

Method and system for directory assistance services

CA 2597142 C · Owner: Filliger, Paul W. · Inventors: Filliger, Paul W.; Cox, Patrick M.; Powell, Adrian P.

CIPO record

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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 mobile telephone, or personal communication services subscriber who wishes directory assistance services is connected in the conventional manner to an operator who identifies a destination telephone number desired by the subscriber. As known in the prior art the operator then initiates a call connecting the subscriber to the destination telephone number. In a preferred embodiment the operator locates a desired destination telephone number in a computer database and can select automatic dialing of the located number. Further rather than dropping all further involvement with the call the preferred embodiment of the present invention continually monitors the connection thereby established …

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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 June 6, 1996 and granted January 31, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2016.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2018.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 6, 1996
GrantedJanuary 31, 2012
Term endedJune 6, 2016
Patent numberCA 2597142 C
Classification (IPC)H04M3/49 +1 more

Timeline

Timeline From CIPO dates

1997199920012003200520072009201120132015Application filedJune 6, 1996Patent grantedJan 31, 2012Term endedJune 6, 2016

Sources & verification

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