Computer controlled speakerphone for adapting to a communication line
CA 2004168 C · Owner: Erving, Richard Henry · Inventors: Erving, Richard Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Computer Controlled Speakerphone for, Adapting to a Communication Line Abstract, A computer controlled speakerphone includes a line adapting arrangement for developing information about an interface between the speakerphone and a hybrid in a communication line and for providing optimal performance during operation by adapting operating parameters of the speakerphone to the line. During a conversation the line adapting arrangement, measures and averages the degree of hybrid reflection that is presented to the speakerphone. The hybrid reflection provides a measure of both the hybrid and a far-end acoustic return. By determining the degree of hybrid reflection the switching threshold level of …
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 29, 1989 and granted July 19, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- 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.