Canadian application, no grantCanada
Apparatus and method in support of completing two calls using analog interface to telephone network
CA 2240906 A1 · Owner: At&T Corp. · Inventors: Burg, Frederick Murray; Crouch, Paul Edward
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An interface apparatus combines multiple calls at a premises that is connected by a single point-of-attachment to a telephone network having a single phone number.
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 May 9, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 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.
FiledMay 9, 1997
GrantedNo grant recorded
Term endedMay 9, 2017
Patent numberCA 2240906 A1
Classification (IPC)H04M11/06 +2 more
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.