Multi-level conference management and notification
CA 2108738 C · Owner: American Telephone And Telegraph Company · Inventors: Bales, Bruce Merrill; Thieler, Stephen Max; Gallagher, Donald Dean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-level conference in which an originator of telephone conference of the multi-level conference controls the parties that can be added to that conference and can terminate any party at any time. Further if two existing telephone conferences, are combined together to form the multi-level conference the party that originated, the combining of these two conference calls can control not only the parties on its conference call but can disconnect all of the parties on the second conference call. In addition, the control of the conference resides in the telephone terminals beingutilized by the participants rather than in a centralized service computer. Information concerning the conference …
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 19, 1993 and granted September 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 19, 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.