Called party mailbox service
CA 2189087 C · Owner: At&T Corp. · Inventors: Lubachevsky, Boris Dmitrievich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A service establishes a called party mailbox (CPMB) for a specified duration of time upon request of a calling party when a called party is unable or unwilling to respond to the calling party. The CPMB service permits a CPMB to be accessed by a called party and permits a CPMB to be modified by authorized users. The statusof access information is available to the calling party which access information, characterizes the extent of access to the established mailbox by the called party. The CPMB is advantageously implemented by a CPMB control system comprising a processor and memory, which CPMB control system is connected to a communications network.
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, 1996 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 29, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2018.
- 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.