Semi-interruptible messages for telephone systems making voice announcements
CA 2221201 C · Owner: Nortel Networks Limited · Inventors: Grosman, Anne; Williamson, Robert Alan; Brennan, Paul Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A call answering system or device for a telephone network provides a mechanism for an outbound message (typically a greeting in a call answering scenario) to be identified as semi-interruptible. An attempt to skip over a semi-interruptible message activates a warning message to alert the caller of the special status of the message. The caller may then choose to resume listening to the original message, or confirm their decision to skip it.
Read the whole patent
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 October 24, 2000. 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.
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.