Network with line monitoring system
CA 2114729 C · Owner: Clarke, Donald Eric Arthur · Inventors: Hale, Michael Anthony; Faulkner, David Wynford; Ballance, John William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for monitoring a network in which a station (1) connected to the network includes a transmitter (2) and a receiver (3). The transmitter (2) outputs a signal modulated with outgoing traffic onto the network and the receiver (3) receives a signal from the network modulated with incoming traffic. The station (1) includes a monitoring circuit (7). The monitoring circuit (7) introduces a variable delay in a signal from the transmitter (2) and combines the delayed signal with the received signal so as to produce an output dependent upon the correlation of the signal from the transmitter (2) and the received signal at the given delay. In a preferred example, the network is an optical …
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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 October 1, 1992 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 1, 2014.
- 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.