State monitoring method and apparatus in subscriber line test
CA 2356210 C · Owner: Nec Corporation · Inventors: Yanagi, Kazuya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a state monitoring method in a subscriber line test in a communication system in which a subscriber telephone and a subscriber terminal are independently connected to a telephone exchange and an ADSL (Asymmetric Digital Subscriber Line) apparatus through a subscriber line, the telephone exchange to which a first control terminal is connected is connected through an interface, to the ADSL apparatus to which a second control terminal is connected. A line blocked state due to a line test instruction is notified from one of the first and second control terminals to the other of the first and second control terminals through the interface. Upon receiving the notification of the line block …
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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 30, 2001 and granted December 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 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.