Frame relay switched data service
CA 2237659 C · Owner: At&T Corp. · Inventors: Holmgren, Stephen L.; Medamana, John Babu; Saksena, Vikram R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new type of data transport service which uses a frame relay layer 2 data link connection identifier (DLCI) to select among various service types feature sets, and/or closed user groups (CUGs) . A layer 3 address may be extracted from a layer 2 frame, and the layer 3 address information may be used to route a data packet over a packet-switched network according to the service classes feature sets, and/or, CUGs selected. At the destination the layer 3 data packet may again be enclosed in a layer 2 frame with a DLCI indicating the service classes features sets, and/or, CUGs. Because the use of conventional permanent virtual circuits (PVCs) is not required in aspects of the invention, new …
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 May 14, 1998 and granted February 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 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.