In-band signaling for routing
CA 2309185 C · Owner: Perlmutter, S. Michael · Inventors: Perlmutter, S. Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Telephone call routing in networks is provided by forwarding routing data other than origination identification and destination identification in-band with calls (107), and using the in-band data at call destinations to do further routing. In some embodiments negotiation is accomplished between routers (201) at different points in the network (104 121 and 122) based on , the in-band routing data. Practice of the invention extends to intelligent telephony networks (100) and as well to simulated telephone calls between computers in wide area data networks, such as the Internet and Intranets.
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 23, 1998 and granted May 27, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2020.
- 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.