Method and system for automatic detection for isdn switch time in north america
CA 2264009 C · Owner: Jou, Liangwha · Inventors: Jou, Liangwha; Davis, William C.; Hamilton, Dean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ISDN modem is preprogrammed to operate by any one of multiple ISDN protocols, and is provided with a setup program (200) wherein with the modem , connected to an ISDN switch the multiple protocols (201, 204, 207) are automatically tested one-at-a-time until one is found by which a successful connection to the switch may be made, or until all fail. In the event a successful connection is made, that protocol in use at the time of the successful connection is selected for continued use. In the event that all preprogrammed protocols fail, a user is offered an input mechanism (211) whereby an alternative protocol selection may be entered for trial.
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 August 11, 1997 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 11, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 11, 2019.
- 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.