System and method for processing dropped calls
CA 2231932 C · Owner: New Cingular Wireless Services, Inc. · Inventors: Amin, Umesh J.; Rotvold, Bruce E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for processing dropped calls. If during an established call between two communication devices a telecommunication network node determines that a communication link to one of the devices has been dropped the node determines the cause of the dropped communication link and sends a status message to the non-dropped communication device. If a reconnection attempt is appropriate the node attempts to reconnect to the dropped device. If a reconnection attempt is not appropriate or if the reconnection attempt is unsuccessful the non-dropped communication device is connected to a voice mail node. If the reconnection attempt is successful the call between the two communication …
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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 March 12, 1998 and granted November 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2020.
- 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.