Filled copper monitoring system
CA 2109261 C · Owner: Sontag, Kenneth N. · Inventors: Sontag, Kenneth N.; Vokey, David E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and a method are disclosed for monitoring electrical cables for the presence of moisture along the cable. The cable is of the type having copper conductors and a metallic shield. The shield is grounded through shield ground units including high pass filters and band pass filters. The band pass filters ground induced AC currents at the local power line frequency, while the high pass filter grounds voice frequency currents from power line harmonics, electric motors and other noise sources. The splices in the system are monitored by splice sensors communicating with the monitoring unit over a twisted pair of the cable.
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 26, 1993 and granted March 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2015.
- 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.