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Expired Canadian patentCanada

Wireless handset feature transparency between switching nodes

CA 2221115 C · Owner: Lucent Technologies Inc. · Inventors: Serkowski, Robert J.; Gallagher, Donald D.; Jorgensen, Russell B.

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

Dividing the function of wireless handset control from the function of telecommunication call control in a software architecture of a wireless telecommunication system. The wireless handset control function follows the wireless handset as it registers and is handed off from switch node to switch node; the telecommunication call control function remains on the switch node on which the wireless handset first became active and remains on that switch node until the wireless handset becomes inactive. Upon the wireless handset becoming inactive the wireless telecommunication call control function is transferred to the switch node on which the wireless handset is currently registered.

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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 14, 1997 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2017.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2019.
  • 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 14, 1997
GrantedJuly 30, 2002
Term endedNovember 14, 2017
Patent numberCA 2221115 C
Classification (IPC)H04J3/12 +1 more

Timeline

Timeline From CIPO dates

1998200020022004200620082010201220142016Application filedNov 14, 1997Patent grantedJuly 30, 2002Term endedNov 14, 2017

Sources & verification

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