Call transfer with automatic return
CA 2102092 C · Owner: American Telephone And Telegraph Company · Inventors: Greenspan, Steven Lloyd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A call processing method where a transferring station can be disconnected from a call after the call is transferred to a third station but where the, call is automatically returned to the transferring station in response to eitherdisconnect signaling or other predefined signaling e.g. a flash or a dual-tone-multi-, frequency (DTMF) tone without requiring any station to dial the transferring station. The transferring station is for a subscriber to a new transfer-with-return feature. The, feature is invoked for the call either in response to a signal from the transferring station requesting invocation of the feature or because the subscriber has only the transfer-with-return feature and no …
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 October 29, 1993 and granted May 6, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2015.
- 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.