Audio-video telephony with firewalls and network address translation
CA 2415357 C · Owner: Read, Stephen Michael · Inventors: Read, Stephen Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a communications system (1) for making multimedia calls. The system comprises two multimedia terminals (10 12) and , communication means for making a multimedia call over a shared communications network (20), including a firewall (26) through which the multimedia call must pass, and which restricts certain types of communication. Each terminal (10 12) has a number of logical communication ports for the multimedia call including at least one dynamically assigned port. In the course of setting up the multimedia call, at least one of the terminals (10 12) is adapted to send , a request to the other of the terminals to open up one or more of the dynamic …
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 July 24, 2001 and granted August 30, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2023.
- 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.